Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
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Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper and Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz variety
sedimentary
Red Jasper (with Quartz inclusion)
Silicon Dioxide (SiO2) with Iron Oxide impurities
sedimentary
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral
Limestone with Gastropod Fossil
Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Quartz (Yellow/Tan Quartzite Pebble)
Silicon Dioxide (SiO2)
metamorphic
Likely weathered mafic rock (basalt or gabbro)
Basalt–gabbroic rock; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Weathered brown stone, possibly mudstone or iron-stained limestone
Indeterminate sedimentary rock; likely clay-rich mudstone/shale or ferruginous limestone
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Chert (Banded)
Cryptocrystalline Silica (SiO2)
sedimentary
Pyrite with Vesicular Matrix
Iron Disulfide (FeS2)
mineral
Quartz (specifically a water-worn Quartzite or Chalcedony pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (White/Milky with Iron Staining)
Silicon Dioxide (SiO2)
mineral
Gray sandstone (likely arkosic or quartz-rich sandstone)
Clastic sandstone, predominantly quartz (SiO₂) with feldspar and rock fragments
sedimentary
Fossilized gastropod (likely nerite or related sea snail)
Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite
fossil
Fine-grained sedimentary rock, likely mudstone
Mudstone (clay- and silt-sized siliciclastic sedimentary rock)
sedimentary
Granite Pebble with Quartz/Feldspar Vein
Intrusive Felsic Igneous Rock (Granite)
igneous
Jasper and Quartz River Cobble
Silicon Dioxide (SiO2) with Hematite inclusions
Sedimentary / Metamorphic
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Pyrite-rich Volcanic Rock
Iron Disulfide (FeS2) in Volcanic Matrix
igneous
Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcedony (Agate)
Chalcedony (Cryptocrystalline Quartz, SiO2)
mineral
Tumbled green aventurine (probable)
Quartzite composed mainly of quartz (SiO₂), colored by fuchsite or other mica inclusions
mineral
Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
metamorphic
Agate with Quartz Druzy
Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline varieties
mineral
Weathered stone nodule or concretion
Unidentified lithic concretion; composition cannot be determined from the image
sedimentary
Likely quartz-rich mineral specimen
Quartz (SiO₂), possibly milky quartz or quartz-bearing rock
mineral
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
igneous
Chalcedony on Ironstone
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3/FeOOH)
sedimentary
Orange Quartz
Silicon Dioxide (SiO2)
mineral
Septarian Nodule Geode
Septarian concretions (composed of Calcite, Aragonite, and Limestone)
sedimentary
Quartzite
Quartzite
metamorphic
Vesicular basalt (possible scoria)
Vesicular basalt; chiefly plagioclase, pyroxene, and possibly olivine
igneous
Banded slate or phyllite
Fine-grained foliated metasedimentary rock; likely slate with light-colored quartz veins
metamorphic
Quartz with Mica (Muscovite or Biotite)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral