Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Category
Mineral Specimen
Browse mineral specimen specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Granite Water-Worn Pebble
Intermediate to Felsic Phaneritic Igneous Rock
igneous
Quartzite (Aventurine type)
Metamorphosed Quartz Sandstone (SiO2 with inclusions)
metamorphic
Sunstone
Aventurine Feldspar (Plagioclase or Oligoclase)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Plume Agate
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Fulgurite
Lechatelierite (Fused Silica)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Caribbean Calcite
Calcite and Aragonite (CaCO3)
mineral
Granitoid (Granite/Granodiorite)
Plutonic igneous rock (variable composition, primarily SiO2)
igneous
Bumblebee Jasper
Carbonate-rich volcanic sediment with arsenic and sulfur inclusions
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Granite Gravel (Pebble)
Intrusive Felsic Igneous Rock
igneous
Jasper (var. Ocean or Polychrome Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Raw galena specimen
Galena (lead sulfide, PbS)
mineral
Honey calcite specimen
Calcite (calcium carbonate, CaCO₃)
mineral
Quartz (Raw Specimen)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (or Porphyritic Scoria)
Vesicular Basalt
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Seraphinite (Clinochlore)
Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rainbow Pyrite
Iron Sulfide (FeS2) with iridescent oxidation
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Marcasite on Agate / Sphalerite-Pyrite Agate Geode Slice
Marcasite (FeS2) / Pyrite on Quartz (SiO2)
mineral
Hypersthene
Enstatite-Ferrosilite series, (Mg,Fe)2Si2O6
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Amethyst
Quartz (Silicon Dioxide) SiO2 with iron impurities
mineral