New answers tagged mineralogy
3
Dyeing agate is a common practice- the stone is real, but it's been cosmetically altered. The stone gets soaked in a chemical solution, which is absorbed into the microscopic pores in the stone. Whatever dye the person who made these coasters used must have been water-soluble. So, yes, cold water would also cause the pigments to bleed.
6
This is not a four- digit number but four separare numbers called Bravais-Miller indices. Bravais-Miller indices descrive the orientation of a crystal plane relative to the symmetry axes of a crystal, as described in Wikipedia. Put very briefly, a zero index means the plane is parallel to that axis, while nonzero indices encode the relative values of the ...
Top 50 recent answers are included
Related Tags
mineralogy × 142geology × 58
geochemistry × 40
minerals × 37
crystallography × 21
rocks × 15
petrology × 14
crystals × 12
geophysics × 8
mining × 7
homework × 6
oceanography × 5
igneous × 5
economic-geology × 5
volcanology × 4
soil × 3
groundwater × 3
biogeochemistry × 3
earth-history × 2
sedimentology × 2
meteorite × 2
geodynamics × 2
mantle × 2
moon × 2
thermodynamics × 2