Likely weathered gneiss or mica-rich schist
Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist
metamorphic
Category
Igneous Or Mineral
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Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Dalmatian Jasper
Peralkaline rhyolite with arfvedsonite inclusions
igneous
Gneiss
Metamorphic Foliated Gneiss
metamorphic
Specular Hematite
Hematite (Fe2O3)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Eudialyte
Na15Ca6(Fe2+,Mn2+)3Zr3(Si,Nb)Si25O73(O,OH,H2O)3(Cl,OH)2
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
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
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Quartz pebble with iron staining
Silicon dioxide (SiO2) with iron oxide inclusions
mineral
Green Aventurine
SiO2
mineral
Sodalite with Syenite (Yooperlite)
Sodalite in Syenite (Na8(Al6Si6O24)Cl2)
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
Quartz
Silicon Dioxide (SiO2)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Epidote-bearing Granite (Unakite-like)
Epidotized Granite
igneous
Mixed Mineral and Rock Collection
Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)
mineral