Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineralological specimen
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
Learn about Mineralological Specimen in the encyclopedia
View all →
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
mineralological specimen
Red Jasper
Quartz (Silicon Dioxide) with Iron Oxide impurities (Fe2O3)
mineralological specimen
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineralological
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineralological
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineralological variety
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Feldspar-rich igneous rock, likely granite or gneiss fragment
Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image
igneous
N/A
This image does not display a rock, mineral, or geological specimen. It shows a human hand wearing a ring.
Not a geological specimen
N/A (man-made object)
N/A
Unable to Identify (Image Obscured)
Indeterminate
Quartz geode or druzy quartz specimen
Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock
mineral
River Stones (Basalt and Sedimentary Rock)
Basalt (dark specimen) and Siltstone/Mudstone (reddish specimen)
igneous and sedimentary
Desert Rose (Gypsum Rose / Barite Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O) or Barium Sulfate (BaSO4) with Sand inclusions
mineral
Gray slate
Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz
metamorphic
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Vesicular volcanic rock, likely pumice or scoria
Pumice/scoria; predominantly volcanic glass with plagioclase, pyroxene, and/or olivine
igneous
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Fragmented Sedimentary Pebble
Clastic Sedimentary Specimen
sedimentary
Fossilized Bivalve Shell
Bivalvia (fossil specimen)
sedimentary
Rock Specimen
Unclassified rock specimen
sedimentary
Generic Rock / Pebble
Undetermined rock specimen
sedimentary
Fossilized Shark Tooth (Root Portion)
Selachimorpha (partial specimen)
fossil
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix
metamorphic
Geodal Limestone / Calcite Druze
Calcium Carbonate (CaCO3)
sedimentary
Trilobite Fossil in Limestone
Trilobita (Class), likely embedded in fossiliferous limestone (CaCO3)
fossil
Quartz with Chlorite or Epidote inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Agate
Silicon Dioxide (SiO2)
sedimentary
Gold Ore in Quartz
Auriferous Quartz (Au + SiO2)
igneous
Quartz geode (likely amethyst-bearing geode)
Microcrystalline quartz and drusy quartz; SiO₂, with possible iron-stained or amethyst quartz
mineral
Weathered porphyritic volcanic rock
Likely andesite or dacite, with feldspar phenocrysts in a fine-grained groundmass
igneous
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Likely weathered basalt
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Echinoidea (Fossil Sea Urchin)
Echinodermata Echinoidea
sedimentary
Tumbled red jasper and blue-green turquoise (likely dyed or stabilized)
Red jasper: microcrystalline quartz, SiO₂, colored by iron oxides; turquoise: hydrated copper-aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Porphyritic granite or granitic gneiss
Quartz–feldspar–biotite granite; possibly foliated into granitic gneiss
igneous
Human Skin (Epidermis/Dermis)
Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)
Mineral-like biological tissue
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Note: No specimen visible
N/A
Quartz (or Chalcedony) Specimen
Silicon Dioxide (SiO2)
mineral