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Carnelian

Carnelian (variety of Chalcedony, SiO2)

Carnelian Agate

Carnelian (Silicon Dioxide - SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

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

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone

Arenite (primarily SiO2)

Vesicular Basalt with Epidote

Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Carnelian

Carnelian (a variety of Chalcedony, SiO ₂)

Citrine

Silicon Dioxide (SiO2) with iron impurities

Fancy Jasper (Ocean Jasper or River Jasper variant)

Silicon Dioxide with inclusions (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Granite

Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)

Druzy Quartz Geode (Oco or Moroccan variety)

Silicon Dioxide (SiO2)

Eclogite

Eclogite (Omphacite + Almandine-Pyrope Garnet)

Granite

Granite (a felsic intrusive igneous rock)

Porphyritic Basalt (or Porphyry)

Porphyritic Basalt (Mafic volcanic rock with phenocrysts)

Smoky Quartz

Silicon Dioxide (SiO2)

Granite

Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)

Pumice

Vesicular Rhyolite or Andesite (Amorphous volcanic glass)

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Biological Specimen (Domestic Dog)

Canis lupus familiaris

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock, primarily SiO2)

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group

Green Jasper

Silicon Dioxide (SiO2) with impurities

Quartz (Druzy) in host rock

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

Pyrite (on host rock/ore)

Iron Sulfide (FeS2)

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Petrified Wood

Silicified Wood (SiO2)

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Sandstone

Arenite (primarily SiO2)

Lapis Lazuli (in Matrix)

Na8[Al6Si6O24]S2 (Lazurite as the primary component)