Rock Identifier

Category

Organic Gem Material (Botanical)

Browse organic gem material (botanical) specimens identified by the Rock Identifier community.

Learn about Organic Gem Material (Botanical) in the encyclopedia

Gem Silica

Peat

Sapropel

Jet

Bituminous Shale

Bituminous Shale

Diamond

Pearl

Black Shale

Elbaite

Peridot

Pegmatite

Iolite

Iron-rich sandstone or weathered ironstone fragment (Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite/goethite) — sedimentary

Iron-rich sandstone or weathered ironstone fragment

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite/goethite

Red Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Ammonite Fossil (Iridiscent) (Ammonoidea (subclass)) — fossil

Ammonite Fossil (Iridiscent)

Ammonoidea (subclass)

Diamond (set in jewelry) (Diamond (Carbon, C)) — mineral

Diamond (set in jewelry)

Diamond (Carbon, C)

Amber (Succinite (C10H16O)) — mineraloid

Amber

Succinite (C10H16O)

Weathered quartz-rich pebble, likely sandstone or quartzite (Quartzite (SiO₂), possibly ferruginous sandstone) — metamorphic

Weathered quartz-rich pebble, likely sandstone or quartzite

Quartzite (SiO₂), possibly ferruginous sandstone

Biotite-rich granite or granitic gneiss (Granite/granitic gneiss; chiefly quartz (SiO₂), feldspar, and biotite mica) — igneous

Biotite-rich granite or granitic gneiss

Granite/granitic gneiss; chiefly quartz (SiO₂), feldspar, and biotite mica

Banded gneiss pebble (Biotite–quartz–feldspar gneiss (composition variable)) — metamorphic

Banded gneiss pebble

Biotite–quartz–feldspar gneiss (composition variable)

Quartz River Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Diamond ring (Diamond (crystalline carbon, C)) — gemstone

Diamond ring

Diamond (crystalline carbon, C)

Blue glassy mineral fragment, likely kyanite or blue corundum (Tentatively kyanite (Al₂SiO₅); visual identification is uncertain from the photograph) — mineral

Blue glassy mineral fragment, likely kyanite or blue corundum

Tentatively kyanite (Al₂SiO₅); visual identification is uncertain from the photograph

Weathered mineralized rock fragment (Indeterminate; likely quartz–feldspar-rich lithic material with iron-oxide staining) — mineral

Weathered mineralized rock fragment

Indeterminate; likely quartz–feldspar-rich lithic material with iron-oxide staining

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Diamond (Diamond (pure Carbon, C)) — mineral

Diamond

Diamond (pure Carbon, C)

Diamond (C (Native Carbon)) — mineral

Diamond

C (Native Carbon)

Petrified Wood (Silicified wood (primarily SiO2 - Silicon Dioxide)) — mineral

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide)

Polished blue sodalite cabochons (Sodalite, Na₈Al₆Si₆O₂₄Cl₂) — mineral

Polished blue sodalite cabochons

Sodalite, Na₈Al₆Si₆O₂₄Cl₂

Microcline Feldspar (KAlSi3O8) — mineral

Microcline Feldspar

KAlSi3O8

Peridot (Olivine) (Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)) — mineral

Peridot (Olivine)

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Flint or chert nodule (Microcrystalline quartz (SiO₂), commonly chalcedony with possible opal and impurities) — sedimentary

Flint or chert nodule

Microcrystalline quartz (SiO₂), commonly chalcedony with possible opal and impurities

Tumbled pink feldspar-rich granite (likely potassium feldspar) (Granite/pegmatitic feldspar aggregate; chiefly KAlSi₃O₈ with quartz and minor mica or iron oxides) — igneous

Tumbled pink feldspar-rich granite (likely potassium feldspar)

Granite/pegmatitic feldspar aggregate; chiefly KAlSi₃O₈ with quartz and minor mica or iron oxides

Weathered agate or chalcedony nodule (Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining) — mineral

Weathered agate or chalcedony nodule

Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining

Vesicular basalt (likely amygdaloidal basalt) (Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, clinopyroxene, and commonly olivine; vesicles are partly mineral-filled amygdules.) — igneous

Vesicular basalt (likely amygdaloidal basalt)

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, clinopyroxene, and commonly olivine; vesicles are partly mineral-filled amygdules.

Olivine (Peridot) (Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4) — mineral

Olivine (Peridot)

Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Turquoise (Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Black Pearl (Tahitian Type) (Aragonite / Pinctada margaritifera (CaCO3 + Conchiolin)) — Organic Gemstone

Black Pearl (Tahitian Type)

Aragonite / Pinctada margaritifera (CaCO3 + Conchiolin)

Organic Gemstone

Petrified Wood (Silicified Wood (Permineralized wood)) — fossil

Petrified Wood

Silicified Wood (Permineralized wood)

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Pearl (Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)) — mineral

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Chert (Agatized/Chalcedony variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Agatized/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Dyed Aura Quartz (Silicon Dioxide (SiO2) with metallic coating) — mineral

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Olivine (Peridot) (Magnesium Iron Silicate ((Mg, Fe)2SiO4)) — mineral

Olivine (Peridot)

Magnesium Iron Silicate ((Mg, Fe)2SiO4)

Labradorite cabochon (Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈) — mineral

Labradorite cabochon

Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Rough Diamond (Pure Carbon (C)) — mineral

Rough Diamond

Pure Carbon (C)

Rough Sapphire (Corundum) (Corundum (Al2O3)) — mineral

Rough Sapphire (Corundum)

Corundum (Al2O3)

Turquoise (CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Olivine (Peridot) (Olivine Group (Mg,Fe)2SiO4) — mineral

Olivine (Peridot)

Olivine Group (Mg,Fe)2SiO4

Polished tiger’s-eye (Chatoyant quartz, mainly fibrous crocidolite pseudomorphed by quartz (SiO₂)) — mineral

Polished tiger’s-eye

Chatoyant quartz, mainly fibrous crocidolite pseudomorphed by quartz (SiO₂)

Olivine Weathered Rock (Dunite) (Dunite ((Mg, Fe)2SiO4)) — igneous

Olivine Weathered Rock (Dunite)

Dunite ((Mg, Fe)2SiO4)

Amazonite (green microcline feldspar) (Microcline, KAlSi₃O₈) — mineral

Amazonite (green microcline feldspar)

Microcline, KAlSi₃O₈

Dendritic jasper/chalcedony (Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites) — mineral

Dendritic jasper/chalcedony

Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites