Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Mineral Specimen
Browse mineral specimen specimens identified by the Rock Identifier community.
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Pink Opal
Hydrated Silica (SiO2·nH2O)
mineral
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Copper Nugget
Native Copper (Cu)
mineral
Dendritic Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe3+)
mineral
Amethyst (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
mineral
Chevron Amethyst
Silicon dioxide, SiO2 (Quartz variety)
Mineral
Pyrite Geode
Iron Disulfide (FeS2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mg/Mn/Chlorite)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Tourmalinated Quartz / Tourmaline in Matrix
Silicate mineral group (Schorl / Quartz)
mineral
Pink Dyed Agate (Pink Agate Slice)
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Ocean Jasper (Orbicular Jasper)
Silica (SiO2) with varied mineral inclusions
mineralogical specimen
Flint (or Chert)
Microcrystalline quartz (SiO2)
sedimentary
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Riverstone (Sandstone or Quartzite)
Sedimentary Rock (likely Arenite)
sedimentary
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Granite or Pegmatite with Quartz and Feldspar
Granitoid
igneous
Vesicular Basalt
Basalt with secondary mineral infills
igneous
Sandstone
Arenite (Sandstone)
sedimentary
Sandstone Cobble
Arenite (primarily Quartz Arenite)
sedimentary
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Water-worn Pebble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Gold Ore
Native Gold in Quartz (Au)
mineral
Emerald in Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Sandstone (Banded)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
mineral
Agate (Fortification Agate)
Banded Chalcedony (SiO2)
mineral
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Dyed Quartz Crystals
Silicon Dioxide (SiO2) with artificial pigment
mineral