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Questions tagged [mineralogy]

questions relating to the scientific study and identification of minerals.

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842 views

Melting point of minerals

Looking at this website, I can see the melting point of the following minerals: http://hyperphysics.phy-astr.gsu.edu/hbase/Geophys/meltrock.html Apparently at a temperature of 1200 °C, all the ...
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1answer
37 views

Is there any rule of thumb to decide the indentation hardness test?

How to decide whether Brinell Hardness test, Rockwell test or Vicker's test is to be applied as far as grain-size is concerned? Is there any rule of thumb to decide the type of indentation hardness ...
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2answers
138 views

Help identify glowing stone with scarab carving

I found almost no information from searching Google, Someone mentioned it might be Fluorite. I simply don't know where else to look for an answer and so I am asking you. When I was a child, my ...
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0answers
25 views

Detecting the hydrothermal alteration zones?

Is it possible to use remote sensing to determine Hydrothermal alteration zones without resorting to collecting samples from the Area of study?
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1answer
255 views

What kind of light blue stone is this?

My son found this stone on the beach on the island Crete. It was a one of its kind, no other visible stone on the beach was the same. We asked the locals, but they did not know this stone. It's about ...
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1answer
147 views

What are the cubic formations found inside Larimar gemstones?

I recently noticed what appears to be common cubic formations just beneath the surface of Pectolite (Larimar) gemstones. They quite resemble transparent sugar sprinkles. Each formation isn't perfectly ...
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5answers
178 views

Which Earth minerals would Moon colonists miss the most?

In my science-based novel, Moon colonists need to return to Earth to collect some rare or absent mineral(s) Ideally, something they could derive from seawater. Which minerals might they be...?
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1answer
1k views

How can I distinguish real from fake? (Jade Stone)

How can I be certain this is jade. I bought this rock from a thrift store for 40 bucks. I thought it was a bit pricey for what it is..does anybody have any solid tips on how to clean up the ...
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2answers
77 views

Iron-nickel phase in pallasite meteorites

I have recently been learning and researching about meteorite types and classification. Pallasites are mainly composed of a 'solid-solution' of olivine crystals and an iron-nickel alloy. My question ...
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1answer
73 views
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1answer
509 views

What disciplines of science are used in the locating and extraction of mineral resources? [closed]

Im trying to do an assessment but I just can answer this question!
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1answer
351 views

Inorganic Limestone and Inorganic Gypsum

I read that limestone is made from the compaction of marine animals' bones. But, I am unable to find out why limestone could not have been produced from calcium occurring naturally (5th most abundant ...
5
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1answer
167 views

Difference between pyrite oxidation and dissolution

I've seen papers use oxidation and dissolution of pyrite. Are these two processes the same? I was always under the impression that pyrite does not dissolve easily. What is the difference between ...
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1answer
62 views

The influence of special emissions (possibly coal mining activity) on particulate matters

Based on multiple site sampling of airborne $PM_{2.5}$ and $PM_{10}$ , the elemental concentrations of the trace elements were analyzed. I have found out in the site near surface coal mining zone ...
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0answers
63 views

Chloride and evaporation

I have a layered aquifer with water that contains high concentrations of calcium and sulfate (~400 mg/L Ca2+, ~1300 mg/L SO42-), at 50 cm below ground surface (bgs), 250 cm bgs and 300 cm bgs. The ...
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0answers
32 views

Formation of dolomite

What are the kinetic barriers to dolomite precipitation? Does it precipitate out in solution as quickly as Calcite does?
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2answers
110 views

Geological maps of British Columbia

I’ve been doing research into mineral deposits in B.C. I’ve been overlaying old claims maps onto Google Earth maps. Are there any good public maps for metallic minerals for British Columbia online?
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1answer
399 views

Saturation Index clarification

I have a problem with my project and I was hoping I would find some clarification. I did some modeling with phreeqc to calculate saturation indices and found that calcite was saturated in an ...
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2answers
62 views

Sulfate salts of magnesium and sodium

What concentrations of magnesium, sodium and sulfate are needed to precipitate solid MgSO4 and Na2SO4 (let's say evaporation is occurring in a system) I'm assuming probably really high because they ...
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2answers
255 views

What is serpentinization, in the context of disappearance of surface water on Mars?

The recent paper in Nature The divergent fates of primitive hydrospheric water on Earth and Mars (Nature 552, 391–394 (21 December 2017) doi:10.1038/nature25031) has been linked by many recent news ...
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80 views

Formation of minerals from decomposition of soil

I was wondering if aerobic decomposition of organic rich soils, also rich in calcium and sulfur, can result in the precipitation of gypsum. My thinking is the decomposition would release the ...
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2answers
214 views

Analyzing composition of a mineral using SEM

If I have a mineral in which I did a SEM analysis on and got the data (elements and their wt% with Std. Dev., MDL, atomic % oxide % and k ratio) how would I go about quantifying the sample's ...
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1answer
163 views

What are these features in the Tombouctou Region?

I’ve recently been very interested in globe-trotting via Google Earth. At first I was using it to plan out hikes to possible mineral deposits locally, or potential fossils/ archeology sites. However I ...
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2answers
79 views

Limitations on mineral precipitation from solution

If the solubility constant for a mineral is exceeded and, thermodynamically, a mineral is favored to precipitate in solution, are there any factors that may limit this from happening? Perhaps kinetics?...
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1answer
421 views

Gypsum saturation index

I did some geochemical modelling and found groundwater samples I have are saturated with respect to the mineral gypsum. I need some help with interpretation, more information is given below. The ...
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3answers
99 views

Why does Australia have no chrome?

I've been trying to collect resource data about Australia for a few years. Some good reference sites are AustraliaMinerals.gov.au and AustralianMinesAtlas.gov.au Australia seems to be pretty rich in ...
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1answer
50 views

Is there a table with decomposition temperatures of common minerals?

I am about to perform a Loss On Ignition test on a material I know that contains among on things kaolinite, which will release water at 500 $^oC$. However, I tried finding a table with decomposition ...
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0answers
206 views

What is this orange/brown crystalline stone that I found near a mining city in the Philippines?

I found this light colored orange rock with white parts on the road in the Compostela Valley area of the Philippines. The back of this stone has a rough surface and is not shiny. Still, there are ...
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2answers
302 views

What is this Lake Michigan rock?

Rock found along northern Lake Michigan, (Charlevoix, MI). Made up of very thin crystalline layers. There are small, round bubble like bumps that protrude from the surface. Doesn't show well in the ...
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0answers
79 views

What mineral is this green part of stone?

On my trip to Chamonix Alps I found this stone and I'm really interested what is this dark green mineral. Color of the stone is dark green. I can't break a bit of it and it seems very much ...
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2answers
269 views

What type of rock is this found in a common UK stone mix?

Can any one help identify this rock? Found in the UK, found in a common garden stone mix. Hard to drill but breaks with a hammer easily. I'm assuming it's fairly common but can't identify it. ...
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2answers
201 views

Identification of dark red mineral

Found in a wooded area after being dug up by my dog. Could not find anything similar online so I thought it best to ask those with far more experience. I'm guessing that it could be petrified wood? I ...
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2answers
64 views

Phase relation for mantle?

I have information about temperature, pressure, normal and shear stresses, viscosity, conductivity, density, heat capacity and adiabatic heating for a particular area of mantle in the form of 2D ...
6
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1answer
196 views

Are there probably decent oil fields located in the middle of the ocean?

I did a google image search for a world map of offshore oil. Surprisingly I found virtually nothing. I had to search country by country for such maps. I noticed most if not all were located very near ...
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1answer
40 views

What are the usable minerals that can be found in our daily life? [closed]

Can anyone tell me what are the minerals that can found at home or something that can be seen in yard or in waste/trash bins.
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2answers
45 views

What are these rocks

This Crystal has a couple gas bubbles and impurities in the very center of it it breaks only one way it is 4720 carats very beautiful very hard
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3answers
655 views

Is it possible to determine where gold might be found based on a map, and if so, how? [duplicate]

Is it possible to locate potential gold deposits using maps that describe dominant rock type, altitude, vegetation, or geological formations? (I realize that the location would probably still have to ...
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1answer
510 views

Rock identification: white/beige crystals

I found this rock along with a few others like it on a hike wanted to know if anyone can help me identify them.
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1answer
92 views

What are these rocks

I found these stones in a quartz vein. I etched the outter soil and debris away and this is what I got
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1answer
60 views

Identify these crystals

What are these? They're slightly green around the edges with clear in the center. I'm assuming geodes. But my friend says they could be Ellensburg Blues?
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2answers
644 views

Where can fluorite be found on Long Island, New York?

I'm interested in fluorite (Since Fluorine is my favorite element, and I wanted a sample of it, even if bonded, but I don't want to buy it; that would be no fun), and I'm curious if it can be found on ...
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1answer
493 views

What are the blue spots in this rock?

The rock is 4 inches (~10 cm) long. The vendor claims this rock is from K2. Are the blue spots real or painted on?
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1answer
250 views

A sedimentary rock with only minerals

In my text book I came across this multiple-choice question A sedimentary rock consists of only minerals and lacks fossils, it could be classified as: i) a clastic sedimentary rock ii) a ...
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2answers
122 views

What are these crystals?

I have got a whole bunch of these crystals.
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2answers
567 views

Identification of dark red, metallic mineral

I recently found this mineral crystallised within quartz at a rock crushing plant. Because of this I have no idea where this rock came from as material is transported to the site from a variety of ...
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2answers
2k views

What are these metallic nodules that were found at low tide on the UK south coast?

Smooth spherical crystalline metal nodules Outside and inside surface does not scratch with a knife blade Inside lustre brassy, radially striated metallic crystals radiating from a lumpy centre at the ...
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1answer
67 views

Is a controlled fractional crystallization process feasible on the Moon?

I am looking for a way to separate metal oxides on the Moon. Please bear with me - it's for an ultra-hard science fiction project. Processes typical on Earth are not effective there. Heat is cheap on ...
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2answers
2k views

Why are most minerals so rare?

There are 4,660 known minerals, so why are most of them so rare? Is it to do with the structure of minerals?
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1answer
67 views

I need some help with a Crystal or mineral

I got this crystal. It is 1 inch long. Flat thin crystal. It was on a small rock. Thank you
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2answers
2k views

Are there any areas on Earth with purplish-colored soil/sand/rock/land?

This sort of comes from my related question, but only sort of. Are there any areas on Earth with purplish-colored soil? The purple tint would come from some mineral, perhaps deposited by rivers or ...