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

Amethyst (Silicon Dioxide (SiO2)) — mineral

Amethyst

Silicon Dioxide (SiO2)

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

Chalcedony Geode / Quartz Druzy

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite) (Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)) — igneous

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Quartz Vein in Sedimentary Matrix (Silicon Dioxide (SiO2) with host rock) — mineral

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Limestone (Decorative Gravel) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Decorative Gravel)

Calcium Carbonate (CaCO3)

Red Jasper (River Polished Quartzite) (Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities) — sedimentary

Red Jasper (River Polished Quartzite)

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities

Unakite (Unakite (epidote-bearing altered granite; mainly pink potassium feldspar, green epidote, and quartz)) — metamorphic

Unakite

Unakite (epidote-bearing altered granite; mainly pink potassium feldspar, green epidote, and quartz)

Jasper and Basalt (Mixed Breccia or Chert) (Silicon Dioxide (SiO2) with Ferromagnesian silicates) — sedimentary and igneous (mixed)

Jasper and Basalt (Mixed Breccia or Chert)

Silicon Dioxide (SiO2) with Ferromagnesian silicates

sedimentary and igneous (mixed)

Citrine Quartz Geode (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz Geode

Silicon Dioxide (SiO2) with iron impurities

Chert / Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Jasper

Microcrystalline Quartz (SiO2)

Coarse-grained Quartz with Feldspar inclusions (Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions) — igneous

Coarse-grained Quartz with Feldspar inclusions

Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions

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

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Amethyst with Quartz Vein (SiO2 (Silicon Dioxide)) — mineral

Amethyst with Quartz Vein

SiO2 (Silicon Dioxide)

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Limonite (FeO(OH)·n(H2O)) — mineral

Limonite

FeO(OH)·n(H2O)

Orbicular Jasper (Ocean Jasper) (Silica-rich Microcrystalline Quartz (SiO2) with various inclusions) — sedimentary

Orbicular Jasper (Ocean Jasper)

Silica-rich Microcrystalline Quartz (SiO2) with various inclusions

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

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chalcedony on Matrix (Silicon Dioxide (SiO2)) — mineral

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Pale green rough mineral specimen, likely serpentine or calcite (Probable serpentine-group mineral, Mg₃Si₂O₅(OH)₄; possibly pale-green calcite, CaCO₃) — mineral

Pale green rough mineral specimen, likely serpentine or calcite

Probable serpentine-group mineral, Mg₃Si₂O₅(OH)₄; possibly pale-green calcite, CaCO₃

Tumbled tan pebble, likely sandstone or chert (Uncertain; probable quartz-rich sandstone (SiO₂-bearing)) — sedimentary

Tumbled tan pebble, likely sandstone or chert

Uncertain; probable quartz-rich sandstone (SiO₂-bearing)

Quartz Pebble (Chert/Chalcedony variety) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Chert (Jasper variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Quartz Pebble (Water-worn) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Water-worn)

Silicon Dioxide (SiO2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Milky quartz-rich rock (Quartz (silicon dioxide, SiO₂), likely with mica or feldspar inclusions) — mineral

Milky quartz-rich rock

Quartz (silicon dioxide, SiO₂), likely with mica or feldspar inclusions

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

Milky quartz

Quartz (silicon dioxide, SiO₂)

Amethyst quartz cluster (Quartz, SiO₂; purple coloration from iron impurities and irradiation) — mineral

Amethyst quartz cluster

Quartz, SiO₂; purple coloration from iron impurities and irradiation

Polished brecciated jasper (Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions) — gemstone

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions

Fossil shell fragment, likely brachiopod or bivalve (Indeterminate fossilized carbonate shell; possibly Spiriferida (brachiopod)) — fossil

Fossil shell fragment, likely brachiopod or bivalve

Indeterminate fossilized carbonate shell; possibly Spiriferida (brachiopod)

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

Milky quartz

Quartz (silicon dioxide, SiO₂)

Rounded pink quartzite pebble (Quartzite; predominantly microcrystalline quartz (SiO₂), with minor iron-oxide staining and possibly feldspar or mica) — metamorphic

Rounded pink quartzite pebble

Quartzite; predominantly microcrystalline quartz (SiO₂), with minor iron-oxide staining and possibly feldspar or mica

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

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Diamond

Diamond (pure Carbon, C)

Boxwork Siderite or Sepatarian Nodule Weathering (Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment) — sedimentary

Boxwork Siderite or Sepatarian Nodule Weathering

Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment

Cubic Zirconia (CZ) (Cubic Zirconium Dioxide (ZrO2)) — mineral (synthetic)

Cubic Zirconia (CZ)

Cubic Zirconium Dioxide (ZrO2)

mineral (synthetic)

Diamond (in a jewelry setting) (Cubic Carbon (C)) — mineral

Diamond (in a jewelry setting)

Cubic Carbon (C)

Chert (and Flint variant) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (and Flint variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

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

Limestone with Fossil inclusions

Fossiliferous Limestone (CaCO3)

Fossiliferous Limestone (Limestone (CaCO3) with Crinoid/Bivalve fossils) — sedimentary

Fossiliferous Limestone

Limestone (CaCO3) with Crinoid/Bivalve fossils