Mineral, Often Found As A Rock (Metamorphic)

Schist

Mica Schist

Fossiliferous Shale or Slate with Plant Fossils

Fossil-bearing argillaceous rock

Granitic Gneiss

Gneiss (High-grade regional metamorphic rock)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Yellow Quartz (Citrine Quartz or Yellow Jasper)

Silicon Dioxide (SiO2) with iron impurities

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)

Smoky Quartz (with complementary stones in jewelry setting)

Smoky Quartz (Silicon Dioxide - SiO2)

Quartz on Basalt

Silicon Dioxide (SiO2) on Mafic Igneous Rock

Granodiorite

Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)

Ruby in Kyanite

Corundum in Disthene (Al2SiO5 + Al2O3)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Sandstone (Tafoni Weathered)

Arenite (part of the Sandstone family)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Smoky Quartz in Matrix

Silicon dioxide (SiO2) within Pegmatite/Gneiss

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Staurolite (Fairy Cross)

Staurolite (Fe2+2Al9Si4O23(OH))

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3

Chrysocolla in Matrix

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Silicate/Secondary Copper Mineral)

Ruby (Raw Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Ruby

Corundum (Al2O3 with Chromium traces)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Quartzite

Quartzite (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

Smoky Quartz

Smoky Quartz (SiO ₂)

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Limonite with Quartz

FeO(OH)·nH2O (Limonite) with SiO2 (Quartz)

Schist

Mica Schist

Gneiss with Quartz/Feldspar Vein

Quartz-Feldspathic Gneiss

Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Raw Corundum (Sapphire/Ruby variant)

Aluminum oxide (Al2O3)

Pumice

Pumice (volcanic rock)

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Quartz

Silicon Dioxide (SiO2)

Milky Quartz in Matrix

Silicon Dioxide (SiO2)

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)

Pyrite (on the right) and Magnetite or Hematite (on the left)

Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)

Bismuth

Bismuth (Bi)