Rock Identifier

Category

Synthetic Or Natural Fiber

Browse synthetic or natural fiber specimens identified by the Rock Identifier community.

Citrine (SiO2 (Silicon Dioxide)) — mineral

Citrine

SiO2 (Silicon Dioxide)

Pearl (Aragonite / Calcium Carbonate (CaCO3)) — mineral

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Rough Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Rough Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Citrine (Crystalline Quartz (SiO2) with iron impurities) — mineral

Citrine

Crystalline Quartz (SiO2) with iron impurities

Diamond (in jewelry mount) (Carbon (C)) — mineral

Diamond (in jewelry mount)

Carbon (C)

Shale (Fissile Mudstone (Shale)) — sedimentary

Shale

Fissile Mudstone (Shale)

Diamond (in jewelry) (Carbon (C)) — mineral

Diamond (in jewelry)

Carbon (C)

Magnetite (Iron Ore) (Magnetite (Fe3O4)) — mineral

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Ruby (Corundum) (Aluminum Oxide (Al2O3) with Chromium traces) — mineral

Ruby (Corundum)

Aluminum Oxide (Al2O3) with Chromium traces

Green Aura Quartz (Titanium treated Kyanite or Quartz) (Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating) — mineral (man-made aura treatment)

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating

mineral (man-made aura treatment)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Precious Red Coral (Corallium rubrum (Calcium Carbonate, CaCO3)) — mineral

Precious Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Sandstone (Arenite (composed primarily of Quartz, SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Green Quartz (Prasiolite) (Silicon Dioxide (SiO2) with trace impurities) — mineral

Green Quartz (Prasiolite)

Silicon Dioxide (SiO2) with trace impurities

Silver (Jewelry Specimen) (Native Silver (Ag)) — Mineral (Native Element)

Silver (Jewelry Specimen)

Native Silver (Ag)

Mineral (Native Element)

Citrine Quartz (Silicon Dioxide (SiO2) with ferric iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Rough Diamond (Diamond (pure carbon, C)) — mineral

Rough Diamond

Diamond (pure carbon, C)

Chert (Jasper/Common Opal mix) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Common Opal mix)

Microcrystalline Quartz (SiO2)

Not a geological specimen (N/A (man-made object)) — N/A

Not a geological specimen

N/A (man-made object)

Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

Pearl (Calcium Carbonate (CaCO3) with Conchiolin) — mineral

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Citrine (Quartz (Silicon Dioxide - SiO2)) — mineral

Citrine

Quartz (Silicon Dioxide - SiO2)

Chert (Holey Stone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Limonite (Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)) — mineral

Limonite

Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Hag Stone (Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes) — sedimentary

Hag Stone

Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Howlite (Tumbled) (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite (Tumbled)

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Pearl (Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)) — mineral

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

Citrine Geode (Citrine (Silicon Dioxide, SiO2)) — mineral

Citrine Geode

Citrine (Silicon Dioxide, SiO2)

Pearl (Biogenic CaCO3 (Aragonite)) — mineral

Pearl

Biogenic CaCO3 (Aragonite)

Raw Corundum (Sapphire/Ruby variant) (Aluminum oxide (Al2O3)) — mineral

Raw Corundum (Sapphire/Ruby variant)

Aluminum oxide (Al2O3)

Engineer Quartz/Quartzite (SiO2 (Silicon Dioxide with binders)) — Sedimentary or metamorphic-derived

Engineer Quartz/Quartzite

SiO2 (Silicon Dioxide with binders)

Sedimentary or metamorphic-derived

Healer's Gold (Pyrite and Magnetite in Schist) (Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist) — metamorphic

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Dyed Dragon Vein Agate (Silicon Dioxide (SiO2) with artificial dye) — mineral

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial dye

Diamond (or Cubic Zirconia simulant) (Carbon (C) or Zirconium Dioxide (ZrO2)) — mineral

Diamond (or Cubic Zirconia simulant)

Carbon (C) or Zirconium Dioxide (ZrO2)

Quartz (Engineered Stone Countertop) (Silicon Dioxide (SiO2) with polymer resins) — Sedimentary-like (Industrial Composite)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Sedimentary-like (Industrial Composite)