Rock Identifier

Category

Mineral Specimen

Browse mineral specimen specimens identified by the Rock Identifier community.

Limonite (Pseudomorph after Pyrite/Marcasite) (Hydrated Iron Oxide (FeO(OH)·nH2O)) — mineral

Limonite (Pseudomorph after Pyrite/Marcasite)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

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

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Bornite (Peacock Ore) (Bornite (Cu5FeS4)) — mineral

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Druzy Quartz (on Chalcedony/Agate base) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Carnelian (Flame Polished) (Carnelian (SiO2 with Iron Oxide impurities)) — mineral

Carnelian (Flame Polished)

Carnelian (SiO2 with Iron Oxide impurities)

Ocean Jasper (Orbicular Jasper) (Silicon Dioxide (SiO2) with iron and magnesium inclusions) — mineral

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Rough Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rough Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Amazonite (Potassium Feldspar (Microcline) - KAlSi3O8) — mineral

Amazonite

Potassium Feldspar (Microcline) - KAlSi3O8

Clear Quartz (Silicon dioxide (SiO2)) — mineral

Clear Quartz

Silicon dioxide (SiO2)

Yellow Citrine Quartz (Silicon Dioxide (SiO₂)) — mineral

Yellow Citrine Quartz

Silicon Dioxide (SiO₂)

Alexandrite in Matrix (Chrysoberyl (BeAl2O4 with Chromium impurities)) — mineral

Alexandrite in Matrix

Chrysoberyl (BeAl2O4 with Chromium impurities)

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

Citrine

Silicon Dioxide (SiO2) with iron impurities

Tree Agate (Silicon Dioxide (SiO2) with Dendritic Inclusions) — Mineral

Tree Agate

Silicon Dioxide (SiO2) with Dendritic Inclusions

Rose Quartz (SiO2 (Silicon Dioxide with trace amounts of titanium, iron, or manganese)) — mineral

Rose Quartz

SiO2 (Silicon Dioxide with trace amounts of titanium, iron, or manganese)

Chrysocolla in Jasper (Chryso-Jasper) (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)) — mineral

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Amazonite (Microcline (KAlSi3O8)) — mineral

Amazonite

Microcline (KAlSi3O8)

Aquamarine (Beryl) (Beryllium aluminum silicate (Be3Al2Si6O18)) — mineral

Aquamarine (Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Massive Quartz with Host Rock (Silicon Dioxide (SiO2)) — mineral

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Milky Quartz with Mineral Inclusions (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Moss Agate (Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite) — Mineral (variety of Chalcedony)

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite

Mineral (variety of Chalcedony)

Jasper (Cryptocrystalline Quartz (SiO2)) — sedimentary

Jasper

Cryptocrystalline Quartz (SiO2)

Quartz with Iron Staining (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Tree Agate (Dendritic Chalcedony (SiO2)) — sedimentary

Tree Agate

Dendritic Chalcedony (SiO2)

Sandstone (Ferruginous) (Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Sandstone (Clastic Sedimentary Rock (composed mostly of SiO2)) — sedimentary

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Sandstone (Weathered Pebble) (Arenite (SiO2 primarily)) — sedimentary

Sandstone (Weathered Pebble)

Arenite (SiO2 primarily)

Sandstone Pebble (Arenite (primarily Quartz, SiO2)) — sedimentary

Sandstone Pebble

Arenite (primarily Quartz, SiO2)

Sandstone (Ferruginous) (Arenite with Iron-oxide inclusions (SiO2 primarily)) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-oxide inclusions (SiO2 primarily)

Banded Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

Jasper in Basalt Matrix (Silicon Dioxide (SiO2) with impurities; Chalcedony) — sedimentary (secondary mineral) within igneous

Jasper in Basalt Matrix

Silicon Dioxide (SiO2) with impurities; Chalcedony

sedimentary (secondary mineral) within igneous

Carnelian Agate (Silicon Dioxide (SiO2) with Iron Oxide impurities) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Oxide impurities

Breciated Howlite (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — Mineral

Breciated Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Chalcedony (Agate/Carnelian type) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)

Fossilized Dinosaur Skull (Tyrannosaurus rex) (Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica) — sedimentary

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica

Dyed Blue Agate (Silicon Dioxide (SiO2)) — Mineral

Dyed Blue Agate

Silicon Dioxide (SiO2)

Diamond (as featured in jewelry) (Diamond (C - pure carbon)) — mineral

Diamond (as featured in jewelry)

Diamond (C - pure carbon)

Quartz (Silicon dioxide (SiO2)) — mineral

Quartz

Silicon dioxide (SiO2)

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

Howlite (Dyed Turquoise) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite (Dyed Turquoise)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)