Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
Granitic Pegmatite (River Rock specimen)
Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)
igneous
Black Tourmaline (Schorl)
Sodium Iron Aluminum Borosilicate (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Wishing Stone (Quartz-veined Siltstone or Graywacke)
Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)
sedimentary
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Graphite Schist
C (Carbonaceous Schist)
metamorphic
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) within a resin matrix
igneous
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Silver (Native Silver Mineral)
Ag (Native Silver), Alloyed 90% Ag / 10% Cu
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Jasper (yellow/cream variety)
SiO₂ (Cryptocrystalline Quartz)
Sedimentary
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (predominantly Silicon Dioxide - SiO2)
metamorphic
Jasper and Quartz River Pebble
Silicon Dioxide (SiO2) with impurities
sedimentary
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Desert Rose (Gypsum Variety)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Mica Schist
Medium-grade regional metamorphic rock (composition varies)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
mineral
Red Chert
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Fossilized Shark Tooth
Carcharodon (Galeocerdo sp. or Lamniform)
mineral
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Calcite
Calcite (CaCO3)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Matrix
igneous/metamorphic