Man Made Object (Metal Alloy)

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Quartzite

Metamorphic Quartzite (SiO2)

Sandstone

Arenite (variable SiO2 composition)

Diamond

Carbon (C)

Vesicular basalt (weathered lava rock)

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine (mafic volcanic rock)

Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)

Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement

Diamond

Carbon (C)

Polished tiger’s-eye cabochon (probable)

Quartz variety, SiO₂, with fibrous riebeckite/crocidolite-derived inclusions

Granite

Phaneritic intrusive felsic igneous rock

Peridot

Olivine (Mg,Fe)2SiO4

Diamond

Carbon (C)

Petrified Wood

Silicified Wood (SiO2)

Polished copper-bearing mineral specimen, likely malachite-rich copper ore

Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite

Pearl

Aragonite (CaCO3 with conchiolin)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Chalk

Calcium Carbonate (CaCO3)

Green Aventurine

Quartz with fuchsite inclusions (SiO2)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Raw calcite specimen

Calcite, calcium carbonate (CaCO₃)

Chondrite Meteorite

Stony Meteorite (Chondrite)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 inclusions)

Shiva Lingam Stone

Cryptocrystalline Quartz (Jasper/Basalt matrix)

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Diamond (faceted)

Diamond (Pure Carbon, C)

Quartzite

Metamorphic quartz rock (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Green Aventurine

Quartz with Fuchsite inclusions (SiO2)

Lapis Lazuli

Lapis lazuli (Complex rock consisting mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Rhodonite

Rhodonite (Mn2+SiO3)

Botryoidal Chalcedony / Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Micro-specimen)

Silicon Dioxide (SiO2)

Diamond (in a jewelry setting)

Cubic Carbon (C)

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

Pink feldspar-bearing granite or pegmatitic rock

Granite/pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and dark mica/amphibole; pink areas may be K-feldspar or garnet.

Likely weathered granite or pegmatitic rock

Granite/pegmatite; primarily quartz (SiO₂), feldspar, and mica

Chert (Flint)

Chert (predominantly SiO₂ - silicon dioxide)

Rhodonite

Inosilicate (Manganese Iron Magnesium Calcium Silicate, (Mn,Fe,Mg,Ca)SiO3)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Diamond

Carbon (C)