Organic Gemstone (Sedimentary Classification)

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Greenschist

Greenschist (containing Chlorite, Actinolite, and Epidote)

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions

Possible basaltic volcanic rock or iron-rich meteorite

Likely basalt (plagioclase–pyroxene rock); meteorite status cannot be confirmed visually

Red Coral

Corallium rubrum

Stony-Iron Meteorite (likely Mesosiderite or Ordinary Chondrite)

Meteorite (Silicate-Metal Matrix)

Lunar Meteorite

Lunar Feldspathic Breccia

Chondrite Meteorite

Ordinary Chondrite (OC)

Red Jasper

Silicon Dioxide (SiO2)

Amber (Copal)

Fossilized Tree Resin (C10H16O)

Amber

Succinicum (Organic Gemstone - Resinite)

Weathered granite or granitic gneiss

Quartz–feldspar–mica granitoid; possible biotite granite or gneiss

Green Chert

Microcrystalline Quartz (SiO2)

Amber (likely a small rough amber piece)

Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral

Amber

Organic gemstone (Succinite is common if from the Baltic)

Iron-rich meteorite candidate

Unclassified stony-iron or iron meteorite candidate; possibly limonite/hematite-bearing terrestrial rock

Chert (Jasper)

Silicon Dioxide (SiO2)

Green Jasper

Microcrystalline Quartz (SiO2) with mineral inclusions

Polished brecciated jasper

Jasper, an opaque microcrystalline quartz variety; primarily SiO₂ with iron-oxide and clay inclusions

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

Amber (Copal)

Succiniferous Resin

Pearls (likely freshwater cultured pearls)

Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin

Petrified Wood

Silicified Wood (SiO2)

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂); likely quartzite if the granular texture is recrystallized sandstone

Rounded granitic gneiss or granitoid boulder

Biotite-bearing orthogneiss; chiefly quartz, feldspar, and biotite

Quartz-rich feldspathic rock, possibly weathered granite or quartzite

Likely quartz and feldspar aggregate; exact identification is uncertain from the photograph

Jasper

Microcrystalline Quartz (SiO2)

Quartz-rich rock, possibly yellow chalcedony or weathered quartzite

Quartz (SiO₂), likely microcrystalline chalcedony with iron-oxide staining

Granite or granitic rock fragment

Felsic intrusive igneous rock, typically quartz + feldspar + mica; exact species uncertain from the image

Green Schist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Jasper/Flint)

Microcrystalline Quartz (SiO2)

Possible iron-rich meteorite fragment

Undetermined; possible stony-iron or iron-oxide-rich meteorite

Blue Apatite

Calcium Phosphate (Ca5(PO4)3(F,Cl,OH))

Quartz-rich granitic rock (likely granite or granitic pegmatite)

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

Dalmatian jasper

Spotted rhyolite (commercially called Dalmatian jasper), chiefly quartz and feldspar with black aegirine/arfvedsonite inclusions

Dalmatian Stone

Dalmatian Jasper (a misnomer) / Perthitic Feldspar Rock

Raw Amber / Resin Mineral

Succinite (Fossilized Tree Resin)

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Iron-rich meteorite candidate

Unclassified stony-iron or iron meteorite; identification requires laboratory testing

Amber (and Cubic Zirconia)

Fossilized Tree Resin