Pyrite
Iron Disulfide (FeS2)
mineral
Category
Igneous And Mineral
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Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Bornite
Copper Iron Sulfide (Cu5FeS4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Muscovite Mica
Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix (often with Chalcopyrite)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Calcite (Optical or Clear Calcite)
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Sodalite with Syenite (Yooperlite)
Sodalite in Syenite (Na8(Al6Si6O24)Cl2)
mineral
Quartz pebble with iron staining
Silicon dioxide (SiO2) with iron oxide inclusions
mineral
Green Aventurine
SiO2
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)
igneous
Epidote-bearing Granite (Unakite-like)
Epidotized Granite
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Mixed Mineral and Rock Collection
Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)
mineral
Blue Apatite
Apatite Group (Ca5(PO4)3(F,Cl,OH))
mineral
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Likely weathered granite or granitic gneiss
Quartz–feldspar–mica rock; possibly gneissic granite
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Milky Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Milky quartz
Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and inclusions
mineral
Likely clear quartz pebble or glassy quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral