mineral
naturally occurring usually inorganic substance that has a (more or less) definite chemical composition and a crystal structure
fool's gold
mineral with metallic luster, usually pyrite, chalcopyrite or biotite
gemstone
piece of mineral used to make jewelry
silicate mineral
rock-forming minerals with predominantly silicate anions
heavy mineral sands ore deposits
ore deposits of rare earth metals
uranium mica
secondary uraninite minerals: autunite, uranocircite, torbernite und zeunerite, mainly
allanite-(Y)
epidote supergroup, sorosilicate mineral
Argillaceous minerals
Fine-grained (less than 2 μm) aluminosilicates (phyllosilicates)
semiprecious stone
minerals, other than precious gems, cut and polished form to make jewelry or other adornments.
light mineral
mineral that is light in color
precious metal minerals
naturally occurring minerals composed of usually 25 atomic percent, or more, precious metals
blende
mineral with a bright luster
sulfide class of minerals
Nickel–Strunz 9 ed mineral class number 2
carbonate and nitrate class of minerals
minerals in which CO3 and NO3 are the main anion
chromate mineral
rare inorganic compounds that have formed from the oxidation of copper-iron-lead sulfide ores containing minor amounts of chromium
heavy mineral
mineral of density greater than 2.89
uranium mineral
mineral that contains a significant proportion of uranium
index mineral
mineral used in geology to determine the degree of metamorphism a rock has experienced
gem
a precious or semi-precious stone, especially when cut and polished or engraved.
silica
mineral, material
metal minerals
naturally occurring minerals composed of usually 25 atomic percent, or more, metal elements