Rock Identifier

Category

Mineralogical Specimen

Browse mineralogical specimen specimens identified by the Rock Identifier community.

Learn about Mineralogical Specimen in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Morganite Crystal

Morganite Crystal

Aquamarine Matrix

Aquamarine Matrix

Emerald Crystal

Emerald Crystal

Aquamarine Crystal

Aquamarine Crystal

Mushroom Tourmaline

Mushroom Tourmaline

White Beryl

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

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

Diamond

Diamond (pure carbon, C)

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Agate (Agate (Silicon Dioxide, SiO2)) — mineral

Agate

Agate (Silicon Dioxide, SiO2)

Chert (Chert / Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Note regarding image quality — Indeterminate

Note regarding image quality

Milky Quartz with Matrix (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Matrix

Quartz (Silicon Dioxide, SiO2)

Quartz (Small Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Agate (within host rock) (Agate (Quartz variety SiO2)) — mineral

Agate (within host rock)

Agate (Quartz variety SiO2)

Purple Agate (Dyed Chalcedony) (SiO2 (Silicon Dioxide) with organic dyes) — mineral

Purple Agate (Dyed Chalcedony)

SiO2 (Silicon Dioxide) with organic dyes

Gold Ore in Quartz (Native Gold (Au) in Quartz (SiO2) matrix) — mineral

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Weathered quartz-rich rock, likely granite or granitic gneiss (Granite (quartz–feldspar–mica aggregate), possibly weathered granitic gneiss) — igneous

Weathered quartz-rich rock, likely granite or granitic gneiss

Granite (quartz–feldspar–mica aggregate), possibly weathered granitic gneiss

Granite Pebble (Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica) — igneous

Granite Pebble

Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Pyrite (Iron Pyrite) with Goethite Oxidation (Iron Sulfide (FeS2)) — mineral

Pyrite (Iron Pyrite) with Goethite Oxidation

Iron Sulfide (FeS2)

Limestone (Grey and White specimens) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

Chert (River Stone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (River Stone)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Limestone with fossil inclusions (CaCO3)) — sedimentary

Fossiliferous Limestone

Limestone with fossil inclusions (CaCO3)

Metal Chain Belt with Square Plates (Not applicable (man-made)) — Man-made Object (Metalwork)

Metal Chain Belt with Square Plates

Not applicable (man-made)

Man-made Object (Metalwork)

Quartz (Smoky/Milky variety with matrix) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky variety with matrix)

Silicon Dioxide (SiO2)

Blue quartz-like mineral specimen (Likely quartz (SiO₂), possibly dyed or coated; exact identification requires testing) — mineral

Blue quartz-like mineral specimen

Likely quartz (SiO₂), possibly dyed or coated; exact identification requires testing

Carnelian Agate Nodule (Chalcedony (SiO2) with Iron Oxide inclusions) — sedimentary

Carnelian Agate Nodule

Chalcedony (SiO2) with Iron Oxide inclusions

Milky Quartz Geode/Nodule (Crystalline Silicon Dioxide (SiO2)) — mineral

Milky Quartz Geode/Nodule

Crystalline Silicon Dioxide (SiO2)

Synthetic Resin (Artificial Specimen) (Polyurethane or Polyester Resin) — mineraloid (man-made)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

mineraloid (man-made)

Green Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

Caribbean Calcite (Calcite and Aragonite (CaCO3)) — mineral

Caribbean Calcite

Calcite and Aragonite (CaCO3)

Milky quartz pebble (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Basalt (River Rock) (Basalt) — igneous

Basalt (River Rock)

Basalt

Almandine Garnet in Matrix (Almandine (Fe3Al2(SiO4)3)) — metamorphic

Almandine Garnet in Matrix

Almandine (Fe3Al2(SiO4)3)

Pink Dyed Agate (Pink Agate Slice) (Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz) — mineral

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Copper-bearing Quartz (with Malachite and Iron Oxides) (Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)) — Mineral Specimen

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Mineral Specimen

Likely weathered quartz-rich stone (Indeterminate; possibly quartz-bearing granite or milky quartz) — mineral

Likely weathered quartz-rich stone

Indeterminate; possibly quartz-bearing granite or milky quartz

Raw galena specimen (Galena (lead sulfide, PbS)) — mineral

Raw galena specimen

Galena (lead sulfide, PbS)

Raw calcite specimen (Calcite, calcium carbonate (CaCO₃)) — mineral

Raw calcite specimen

Calcite, calcium carbonate (CaCO₃)

Honey calcite specimen (Calcite (calcium carbonate, CaCO₃)) — mineral

Honey calcite specimen

Calcite (calcium carbonate, CaCO₃)

Quartz (Raw Specimen) (Silicon Dioxide (SiO2)) — mineral

Quartz (Raw Specimen)

Silicon Dioxide (SiO2)

Staghorn Coral Specimen (Acropora cervicornis (Calcium Carbonate, CaCO3)) — sedimentary

Staghorn Coral Specimen

Acropora cervicornis (Calcium Carbonate, CaCO3)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (high SiO2 content)) — metamorphic

Quartzite

Quartzite (high SiO2 content)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Mixed tumbled stone collection (Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite) — mineral

Mixed tumbled stone collection

Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite

Banded gneiss pebble (Gneiss, chiefly quartz–feldspar–mica with dark biotite/amphibole bands) — metamorphic

Banded gneiss pebble

Gneiss, chiefly quartz–feldspar–mica with dark biotite/amphibole bands

Red Sandstone (Arenite (SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Arenite (SiO2 with Fe2O3)