Rock Identifier

Category

Mineralological Specimen

Browse mineralological specimen specimens identified by the Rock Identifier community.

Learn about Mineralological 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

Smoky Quartz

Clear Obsidian

Goshenite Crystal

Goshenite Crystal

Magnetite

Crocoite

Elbaite

Vesicular basalt (possible scoria) (Vesicular basalt; chiefly plagioclase, pyroxene, and possibly olivine) — igneous

Vesicular basalt (possible scoria)

Vesicular basalt; chiefly plagioclase, pyroxene, and possibly olivine

Banded slate or phyllite (Fine-grained foliated metasedimentary rock; likely slate with light-colored quartz veins) — metamorphic

Banded slate or phyllite

Fine-grained foliated metasedimentary rock; likely slate with light-colored quartz veins

Quartz with Mica (Muscovite or Biotite) (Silicon Dioxide (SiO2) with Phyllosilicates) — mineral

Quartz with Mica (Muscovite or Biotite)

Silicon Dioxide (SiO2) with Phyllosilicates

Smoky Quartz (with Iron Oxidation) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (with Iron Oxidation)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sunstone (Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions) — mineral

Sunstone

Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions

Quartz (Milky or Smoky) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Smoky)

Silicon Dioxide (SiO2)

Fossil shell fragment, likely bivalve or gastropod (Fossilized calcium-carbonate shell; likely aragonite/calcite replaced by calcite) — fossil

Fossil shell fragment, likely bivalve or gastropod

Fossilized calcium-carbonate shell; likely aragonite/calcite replaced by calcite

Black cabochon gemstone, likely onyx or agate (Likely chalcedony (microcrystalline quartz, SiO₂); exact identification is not possible from the photo) — gemstone

Black cabochon gemstone, likely onyx or agate

Likely chalcedony (microcrystalline quartz, SiO₂); exact identification is not possible from the photo

Green cabochon pendant, likely jade (Probably nephrite jade (tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); visual identification is uncertain) — gemstone

Green cabochon pendant, likely jade

Probably nephrite jade (tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); visual identification is uncertain

Banded Agate (Chalcedony (Silicon Dioxide, SiO2)) — sedimentary

Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Amazonite (Microcline (KAlSi3O8)) — mineral

Amazonite

Microcline (KAlSi3O8)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Hematite/Limonite inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Green Jasper / Chalcedony (Silicon Dioxide (SiO2)) — sedimentary

Green Jasper / Chalcedony

Silicon Dioxide (SiO2)

Petrified Wood (Agatized or Silicified Wood (SiO2)) — fossil

Petrified Wood

Agatized or Silicified Wood (SiO2)

Prehnite (Ca2Al2Si3O10(OH)2) — mineral

Prehnite

Ca2Al2Si3O10(OH)2

Amazonite (Microcline (K(AlSi3O8))) — mineral

Amazonite

Microcline (K(AlSi3O8))

Banded Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

Moqui Marble (Iron Oxide Concretion (Limonite/Hematite shell with Sandstone core)) — sedimentary

Moqui Marble

Iron Oxide Concretion (Limonite/Hematite shell with Sandstone core)

Agate and Chalcedony (Bead Jewelry) (Silicon Dioxide (SiO2)) — gemstone

Agate and Chalcedony (Bead Jewelry)

Silicon Dioxide (SiO2)

Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

Bloodstone (Chalcedony (Variety: Bloodstone / Heliotrope), SiO2) — mineral

Bloodstone

Chalcedony (Variety: Bloodstone / Heliotrope), SiO2

Agate (Silicon Dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz in Host Rock (Silicon Dioxide (SiO2)) — mineral

Quartz in Host Rock

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Tiger's Eye (Quartz pseudomorph after crocidolite (SiO2)) — gemstone

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Tumbled Sunstone (Plagioclase Feldspar (Na,Ca)(Al,Si)4O8) — gemstone

Tumbled Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Jasper (Microcrystalline Quartz (SiO2)) — mineral

Jasper

Microcrystalline Quartz (SiO2)

Jasper (Brown Jasper) (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Jasper (Brown Jasper)

Microcrystalline Quartz (Chalcedony), SiO2

Lake Superior Agate (Silicon Dioxide (Chalcedony/Quartz), SiO2) — sedimentary

Lake Superior Agate

Silicon Dioxide (Chalcedony/Quartz), SiO2

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Quartz / Chalcedony Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz / Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Quartz Vein in Basalt or Slate (Hydrothermal quartz vein traversing mafic host rock) — metamorphic

Quartz Vein in Basalt or Slate

Hydrothermal quartz vein traversing mafic host rock

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Sunstone Quartz / Aventurine Quartz (Silicon Dioxide (SiO2) with inclusions) — mineral

Sunstone Quartz / Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions

Limonite (FeO(OH)•nH2O) — mineral

Limonite

FeO(OH)•nH2O

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Green Jasper / Green Quartz (Silicon dioxide (SiO2) with mineral impurities) — sedimentary

Green Jasper / Green Quartz

Silicon dioxide (SiO2) with mineral impurities

Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)