Herkimer Diamond
Quartz (Silicon Dioxide - SiO2)
mineral
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
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Quartzite river stone
Quartzite (SiO2 silicon dioxide)
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Red aventurine
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
metamorphic
Dalmation Stone (Dalmation Jasper)
Peralkaline Rock with Feldspar and Arfvedsonite
igneous
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Diamond (or Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Yellow Quartz (Citrine Quartz or Yellow Chalcedony)
Silicon Dioxide (SiO2)
mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Diamond Druzy (Crystalline Diamond)
Carbon (C)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Moonstone (specifically Cat's Eye or Gray Moonstone)
Orthoclase (Potassium Aluminum Silicate) with the formula (K,Na)AlSi3O8
mineral
Granite
Phaneritic plutonic rock (primarily Quartz, Alkali Feldspar, and Plagioclase)
igneous
Rough Diamond
Diamond (pure Carbon, C)
mineral
Asphalt (Bituminous pavement fragment)
Artificial conglomerate / Bitumen-Aggregate mixture
sedimentary
Ruby (Raw/Rough)
Corundum (Al2O3 with Chromium trace)
mineral
Diamond
Carbon (C)
mineral
Diamond (set in a gold ring)
Carbon (C) - Adamantine cubic carbon
mineral
Diamond
Carbon (C)
mineral
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granite
Phaneritic plutonic rock (SiO2 > 69%)
igneous
Fossiliferous Limestone
Biomicrite / Limestone with fossils
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (pure carbon, C)
mineral
Granite
Felsic intrusive igneous rock (Granite)
igneous
Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
mineral
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Ocean Jasper Mushroom
Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)
mineral
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Hag Stone
Siltstone or Fine-grained Sandstone with boring (e.g., Lithophaga impact)
sedimentary