Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
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Mixed Polished Gemstones (Tumbled Stones)
Mixed Silicates and Oxides (SiO2, KAlSi3O8, Ca2Al2Be3Si6O22, etc.)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Fossil Coral
Scleractinia (Anthos), primarily Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Chert (specifically Black Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Turquoise and Red Coral
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)
mineral
Quartz (Pebble)
Quartz (SiO₂)
Mineral
Amber (Green variation)
Succinite
fossil
Fossilized Shark Tooth (Anterior/Lateral)
Otodus megalodon or Carcharodon carcharias (fossilized)
fossil
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shark Tooth Fossil
Elasmobranchii fossil (likely Carcharias or Odontaspis sp.)
fossil
Lava Rock (Basalt)
Basalt (extrusive igneous rock)
igneous
Diamond
C (Carbon)
gemstone
Diamond (in Jewelry Setting)
Carbon (C) - Isometric-Hexoctahedral
mineral
Geode (Unopened)
Silica-rich Concretion (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Tumbled white chalcedony (likely milky quartz)
Chalcedony, microcrystalline SiO₂; possibly milky quartz
mineral
Rose quartz (probable)
Quartz, SiO₂; pink coloration typically from trace inclusions or irradiation-related defects
mineral
Granite pebble
Granite, chiefly quartz, feldspar, and mica
igneous
Amethyst cluster
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Weathered granite or granitic gneiss
Granite; predominantly quartz, feldspar, and mica, possibly altered to gneiss
igneous
Tumbled yellow-brown translucent stones, likely quartz/chalcedony
Quartz (SiO₂) or microcrystalline quartz (chalcedony); exact identification requires testing
mineral
Likely anthracite coal
Anthracite; predominantly carbon (C), with minor mineral impurities
sedimentary
Vesicular basalt (scoria-like volcanic rock)
Basalt; primarily plagioclase, clinopyroxene, and olivine, with abundant vesicles
igneous
Probable weathered granite or granitic gneiss
Granite/granitic gneiss; mainly quartz, feldspar, and mica
igneous
Rounded granitic gneiss or granite cobble
Granite; primarily quartz, plagioclase and potassium feldspar with biotite/hornblende
igneous
Weathered mica-rich metamorphic rock
Probable biotite schist or mica schist
metamorphic
Weathered granitic rock
Granite or granodiorite, likely quartz–feldspar–mica aggregate
igneous
Gneiss
Foliated quartzo-feldspathic gneiss, commonly containing biotite or amphibole
metamorphic
Quartz geode (likely amethyst-bearing geode)
Microcrystalline quartz and drusy quartz; SiO₂, with possible iron-stained or amethyst quartz
mineral
Dark volcanic sand / basaltic sand
Basalt-derived lithic sand, chiefly plagioclase, pyroxene, and volcanic glass
igneous
Amethyst-bearing quartz
Quartz, SiO₂; purple variety amethyst, commonly in an amethyst-bearing geode or basaltic cavity
mineral
Tumbled rose quartz
Quartz (SiO₂), pink variety
mineral
Small rounded stone, likely basalt or weathered mafic rock
Fine-grained basalt; exact identification requires testing
igneous
Sodalite
Na4Al3(SiO4)3Cl (Sodium Aluminum Silicate Chloride)
mineral