Smoky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
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Iron-stained weathered rock
Unknown
Unknown (likely sedimentary or metamorphic)
Quartz with Chlorite inclusions
SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2⋅(Mg,Fe)3(OH)6
mineral
Rose Quartz
Silicon dioxide, SiO2
mineral
Agate
Cryptocrystalline Quartz, SiO2
mineral
Spinosaurus Tooth Fossil
Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Vein Quartz in Basalt or Chert
Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Rugose Coral Fossil
Rugosa (Order)
sedimentary
Granite pebble
Granite; chiefly quartz, alkali feldspar, plagioclase, and mica
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Tumbled yellow calcite
Calcite (CaCO₃)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Lightning Stone / Fulgurite-impregnated or Septarian-like Agate
Silicon dioxide (Quartz/Chalcedony) with host rock matrix
sedimentary
Red heart-shaped glass bead in a wire-wrapped jewelry charm
Likely colored glass (amorphous silica-based material); the image does not show an identifiable geological specimen
gemstone
Weathered iron-rich quartz vein in altered host rock
Goethite–hematite limonite with quartz and iron-oxide alteration
metamorphic
Chert (Cherty Limestone or Flint)
Microcrystalline Silica (SiO2)
sedimentary
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
River Quartz Pitting/Cobble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Pyrite (fool’s gold)
Pyrite, FeS₂
mineral
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Dark mafic metamorphic rock, likely amphibolite
Amphibolite; chiefly hornblende amphibole and plagioclase feldspar
metamorphic
River Stone (possibly Gneiss)
Metamorphic Gneiss
metamorphic
Weathered basalt or andesitic volcanic rock
Porphyritic basalt–andesite; likely plagioclase and pyroxene with iron-oxide alteration
igneous
Iron-stained quartz-bearing rock (probable weathered quartz vein or ironstone)
Quartz (SiO₂) with goethite/limonite iron oxides; possibly altered volcanic or metamorphic host rock
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Jasper-Agate
Silicon Dioxide (SiO2)
sedimentary
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Pink-and-green mineral specimen, possibly unakite
Unakite, an epidote–feldspar–quartz rock; identification is uncertain from the photo
metamorphic
Epidosite with Quartz (Unakite-variant or Jasper)
Epidotized Metasomatite
metamorphic
Tumbled cream-colored stone, likely quartzite or chert
Quartzite (SiO₂), or microcrystalline quartz/chert (SiO₂)
metamorphic
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Amethyst on Basalt
Silicon dioxide (SiO2) with trace Iron
mineral
Water-worn quartzite or sandstone cobble
Quartzite (predominantly SiO₂), possibly quartz-rich sandstone
metamorphic