Granitoid (Pegmatitic Granite)
Granitoid with dominant Potassium Feldspar and Quartz
igneous
Category
Industrial Byproduct (Anthropogenic Rock)
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Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Diamond
Diamond (pure carbon, C)
mineral
Schist
Mica Schist
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Schist
Mica Schist
metamorphic
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Diamond
Carbon (C)
mineral
Garnet and Quartz
Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (mostly SiO2)
metamorphic
Sapphire (Rough Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Garnet in Matrix
Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)
metamorphic
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Beryl (Aquamarine variety)
Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)
mineral
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Diamond
Carbon (C)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Dumortierite Quartz
Dumortierite-bearing Quartz (Al7BO3(SiO4)3O3)
metamorphic
Garnet (likely Almandine or Pyrope)
Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)
mineral
Peach Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Yellow or Honey Quartz
Silicon Dioxide (SiO2)
mineral
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Diamond
Carbon (C) - Native Element
mineral
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
mineral
Iron meteorite fragment (likely weathered meteorite)
Fe–Ni metal, commonly kamacite with taenite; possible stony-iron or iron-oxide fusion crust
meteorite
Chert (Flint)
Chert (SiO2)
sedimentary
Rough Diamond
Diamond (C)
mineral
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous