Questions tagged [rocks]

Questions about rock types, formation, chemistry, and physics. If you just want help identifying a rock please use the tag "identification-request".

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What kind of rock is this?? White rock [closed]

What kind of rock is this?? Found laying on the surface of gravel.
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1answer
54 views

Rock identification ? What kind of it is? [closed]

My co-worker had this rock and told me found just behind the store, Big R, and put on the table in the office. Location is Trindad, Colorado.
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1answer
65 views

What is the definition of “ground-up shell”?

The archeologists use the term "ground-up shell" to designate a type of temper used for pottery. What is this material? Earth containing fossilized mollusk shells? I noticed the term is also used in ...
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55 views

Is there any covalent crystals that can be easily synthesized?

I am looking for a kind of crystal that can be artificially made at relatively low temperatures (below 1500 degree Celsius) and relatively quickly (not geological time). The product is ideally ...
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1answer
113 views

I need help with these geode like rocks [closed]

I found these rocks in my pasture and was excited because I thought I had found some geodes. The rocks were in a sandy bank and looked like eggs sticking out of the bank. I am located in Ness County ...
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2answers
233 views

What type of yellow-green stone is this? [closed]

It's greenish yellow with white. Got it in a mixed stone package from Amazon. No luster, I'd say a 7 in hardness, it doesn't look homogeneous.
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77 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 ...
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0answers
38 views

Glassy Rock/Mineral Identification in Victoria, BC (Canada) [closed]

The following rock (image below) was found in my in-laws backyard recently. The location is Victoria, BC (Canada) and is fairly far in-land (tens of kilometers from any coastlines). Its surface is ...
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42 views

Estimations of time to turn a beach rock into this?

[ROUND BEACH STONECan anyone help determine how long it would have taken to turn this rock into the ball it is now? heavy density .Found on the South Coast here in the UK near Lyme Regis (Jurassic ...
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1answer
47 views

If gypsum turns into plaster around 210 F, is there any natural plaster deposits or formations out there?

For a while I have been working with gypsum I mined from a site in Utah, and I realized how low the temperature is to turn it into plaster, so I was wandering; has there ever been any cases of large ...
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Hi please could someone help identify this rock. Received it as a gift from a friend [closed]

The rock has green,purple and white stripes.
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1answer
83 views

Color in Gems and Rocks [duplicate]

Why is it that gems/ rocks, such as Ruby, Sapphire, Topaz, etc... all have their own unique colors? Is this something that happens from chemical attraction with each stone upon formation?

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