Metamorphic Rock (Composed Of Multiple Minerals)

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)

Graphite

Graphite (Carbon, C)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Limonite Concretion

Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

White Jade / White Chalcedony

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)

Gneiss (specifically Banded Gneiss)

Gneiss

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Green Schist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Granite Pebble

Granite (Phaneritic Acidic Igneous Rock)

Jasper with Epidote (Unakite-related)

Epidotized Quartzite (composed of Quartz, Epidote, and Feldspar)

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

Quartz (in a rock matrix)

Quartz (SiO2)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Lapis Lazuli

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

Not a rock, mineral, or geological specimen

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Mica Schist

Schist (primarily Muscovite and Biotite mica)

Quartz

Quartz (SiO₂)

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Quartz with Chlorite or Hornblende inclusions

Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Diorite

Diorite (Intermediate intrusive igneous rock)

Rhodonite

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

Quartz vein in metamorphic rock

Crystalline Silicon Dioxide (SiO2) in Host Rock

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Gneiss

Gneiss (Metamorphic high-grade)

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Granite

Phaneritic Felsic Igneous Rock

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Soapstone (Talc-Schist)

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

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Stromatolite

Biogenic Sedimentary Rock (composed predominantly of CaCO3)