Metamorphic Rock (Primarily Composed Of Minerals)

Granitoid (Granite/Gneiss)

Granitoid silicate rock, primarily quartz and feldspar

Petrified Wood

Silicified wood (primarily Silicon Dioxide - SiO2)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Diorite

Diorite (Intermediate intrusive igneous rock)

Granite

Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)

Serpentinite

Serpentinite (composed primarily of mineral group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)

Desert Rose (Gypsum Variety)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Gneiss

High-grade foliated metamorphic rock

Soapstone

Steatite (composed primarily of Talc, Mg3Si4O10(OH)2)

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Greenschist (Chlorite Schist)

Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)

Diamond

Diamond (pure Carbon, C)

Granite

Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Rough Dark Green Sapphire

Corundum (Al2O3)

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Petrified Wood

Silicified Wood (SiO2)

Ruby in Kyanite

Corundum in Disthene (Al2SiO5 + Al2O3)

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)

Gneiss (complex silicate composition)

Chalcedony (River Stone)

Microcrystalline Quartz (SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (Grooved/Weathered)

Arenite (composed primarily of Quartz and Lithic fragments)

Granite

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)

Limestone

Calcium Carbonate (CaCO3)

Mica Schist

Mica Schist (Composition typically includes Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)

Lapis Lazuli

Sodalite-rich metamorphic rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Quartzite (or Ferruginous Quartzite)

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 impurities)

Sandstone or Limestone

Arenite or Calcareous Sedimentary Rock

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Unakite

Epidote-Feldspar rock

Sandstone

Arenite (Clastic Sedimentary Rock)

Basalt

Basalt (Aphanitic extrusive igneous rock)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Specular Hematite (Specularite) in Matrix

Specularite (Fe2O3)

Granite

Phaneritic Acidic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Yellow Apatite Sphere (Polished)

Fluorapatite / Ca5(PO4)3F