Man Made Material

Weathered granite or granitic rock fragment

Granite; chiefly quartz, feldspar, and mica (composition uncertain from image)

Greenish translucent mineral fragment

Indeterminate; possibly serpentine, epidote, or green glassy feldspar

Gneissic Schist

Foliated Metamorphic Rock (Schist/Gneiss transition)

Iron-rich breccia

Hematite–goethite-rich ferruginous breccia, likely a lateritic ironstone

Vesicular volcanic rock, likely pumice or scoriaceous rhyolite

Vesicular rhyolite/dacite; predominantly silica-rich volcanic glass with feldspar and quartz

Tumbled beige stone, possibly jasper or limestone

Indeterminate; likely microcrystalline quartz (jasper) or calcium-carbonate limestone

Banded limestone or marble

Calcite-dominated carbonate rock; likely banded marble (CaCO₃)

Likely schist, possibly serpentinite

Mica schist; potential chlorite–serpentine-rich metamorphic rock

Fossiliferous limestone, possibly an oyster or other bivalve fossil

Calcite (CaCO₃) shell material preserved in micritic limestone; exact fossil taxon cannot be confirmed from one image

Chert or flint fragment

Microcrystalline quartz (SiO₂), commonly called chalcedony or flint

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Weathered fine-grained stone, likely sandstone or quartzite

Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂

Chert Geode Nodules

Microcrystalline Quartz (SiO2)

Polished ocean jasper (orbicular jasper), probable

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Citrine Quartz / Yellow Quartz Pebbles

Silicon Dioxide (SiO2)

Diamond (in Ring Setting)

Diamond (Pure Carbon, C)

Diamond

Diamond (C)

Sandstone with Dendritic Inclusions

Quartzose Sandstone

Fossilized wood fragment

Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)

Moissanite

Silicon Carbide (SiC)

Jasper

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2)

Limonite

Limonite (FeOO·nH2O)

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia - ZrO2, Moissanite - SiC)

Diamond

Carbon (C)

Green cabochon gemstone pendant

Indeterminate; likely dyed green turquoise, chrysoprase, or opaque beryl set with blue/clear accent stones

Chert Nodule / Flint

Microcrystalline Quartz (SiO2)

Diabase

Diabase (also known as Dolerite)

Limestone

Calcium Carbonate (CaCO3)

Granite

Phaneritic Felsic Igneous Rock

Chert (Yellow or Brown Jasper)

Microcrystalline Quartz (SiO2)

White Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sand Grain (Quartz)

Silicon Dioxide (SiO2)

Rhodonite

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

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Chert (Flint Pebbles)

Microcrystalline Quartz (SiO2)

Chert (Basanite / Jasperoid)

Microcrystalline Quartz (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Red Sandstone (Iron-Rich)

Arenite (Fe2O3)