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

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)

Quartz-veined Metamorphic Pebble (Silicate-rich metamorphic rock with quartz veins (SiO2)) — metamorphic

Quartz-veined Metamorphic Pebble

Silicate-rich metamorphic rock with quartz veins (SiO2)

Quartz-veined Granite or Gneiss Pebble (Silicate-rich metamorphic rock fragment) — metamorphic

Quartz-veined Granite or Gneiss Pebble

Silicate-rich metamorphic rock fragment

Larimar (Pectolite (NaCa2Si3O8(OH))) — gemstone

Larimar

Pectolite (NaCa2Si3O8(OH))

Pyrite in Quartz (Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)) — mineral

Pyrite in Quartz

Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)

Agate (Silicon dioxide (Chalcedony variety)) — sedimentary

Agate

Silicon dioxide (Chalcedony variety)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Montana Agate (Silicon Dioxide (Chalcedony), SiO2) — gemstone

Montana Agate

Silicon Dioxide (Chalcedony), SiO2

Wavellite with Quartz (Al3(PO4)2(OH,F)3 & SiO2) — mineral

Wavellite with Quartz

Al3(PO4)2(OH,F)3 & SiO2

Quartz Veined Quartzite or Sandstone (Quartzite with Quartz Veins (SiO2)) — sedimentary

Quartz Veined Quartzite or Sandstone

Quartzite with Quartz Veins (SiO2)

Amazonite (Microcline Feldspar (KAlSi3O8)) — mineral

Amazonite

Microcline Feldspar (KAlSi3O8)

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)

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)

Dendritic Agate or Manganese Nodule in Chert/Limestone (Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions) — sedimentary

Dendritic Agate or Manganese Nodule in Chert/Limestone

Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions

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

Peridot

Olivine (Mg, Fe)2SiO4

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Amazonite (Microcline (KAlSi3O8) with lead impurities) — mineral

Amazonite

Microcline (KAlSi3O8) with lead impurities

Sunstone ((Ca,Na)((Al,Si)2Si2)O8 (Plagioclase Feldspar)) — mineral

Sunstone

(Ca,Na)((Al,Si)2Si2)O8 (Plagioclase Feldspar)

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

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Green Opal (Opal (Hydrated silica, SiO2·nH2O)) — mineral

Green Opal

Opal (Hydrated silica, SiO2·nH2O)

Vesicular basalt (scoria-like volcanic rock) (Basalt, predominantly plagioclase + pyroxene ± olivine; vesicular variety) — igneous

Vesicular basalt (scoria-like volcanic rock)

Basalt, predominantly plagioclase + pyroxene ± olivine; vesicular variety