Rock Identifier

Category

Synthetic Or Natural Fiber

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

Quartz (Engineered Quartz Surface) (Silicon Dioxide (SiO2) based composite) — mineral (man-made composite)

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

mineral (man-made composite)

Coquina (Hag Stone variant) (Biocalcarenite (Coquina)) — sedimentary

Coquina (Hag Stone variant)

Biocalcarenite (Coquina)

Libyan Desert Glass (Impactite (vitreous silica), SiO2) — mineral

Libyan Desert Glass

Impactite (vitreous silica), SiO2

Asphalt (Road Aggregate) (Asphalt concrete / Bituminous mixture) — anthropogenic sedimentary (technolith)

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

anthropogenic sedimentary (technolith)

Moissanite (Silicon Carbide (SiC)) — mineral

Moissanite

Silicon Carbide (SiC)

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Diamond (C (Carbon)) — mineral

Diamond

C (Carbon)

Black Pearl (Tahitian Style) (Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin) — mineral

Black Pearl (Tahitian Style)

Calcium Carbonate (Aragonite) - CaCO3 with Conchiolin

Diamond (Colorless/White) (Carbon (C)) — mineral

Diamond (Colorless/White)

Carbon (C)

Obsidian (Vitreous volcanic silicate (70-75% SiO2)) — igneous

Obsidian

Vitreous volcanic silicate (70-75% SiO2)

Bismuth (Bismuth (element Bi) with oxidized thin-film interference layer) — mineral

Bismuth

Bismuth (element Bi) with oxidized thin-film interference layer

Shale (Fissile Mudstone (primarily composed of clay minerals and quartz grains)) — sedimentary

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz grains)

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

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (with Iron Staining) (Clastic sedimentary rock (primarily Quartz - SiO2)) — sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz - SiO2)

Aventurine (Tan/Cream colored) (Quartz (SiO2) with mineral inclusions) — mineral

Aventurine (Tan/Cream colored)

Quartz (SiO2) with mineral inclusions

Sandstone (Ferruginous) (Arenite with Iron-Oxide Cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Almandine Garnet & Tumbled Citrine Quartz (Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)) — mineral

Almandine Garnet & Tumbled Citrine Quartz

Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Diamond (Set in Jewelry) (C (Native Carbon)) — mineral

Diamond (Set in Jewelry)

C (Native Carbon)

Sandstone (likely Arkosic) (Arenite (SiO2 with KAlSi3O8)) — sedimentary

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

Green Garden Quartz (Phantom Quartz) (Silicon Dioxide (SiO2) with Chlorite inclusions) — mineral

Green Garden Quartz (Phantom Quartz)

Silicon Dioxide (SiO2) with Chlorite inclusions

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

Rough Diamond

Diamond (pure Carbon, C)

Limestone (specifically Travertine or Tufa) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

Sandstone (likely Arkosic or Lithic) (Clastic Sedimentary Rock (SiO2 with accessory minerals)) — sedimentary

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Diamond (C (Carbon)) — mineral

Diamond

C (Carbon)

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

Diamond (in jewelry setting)

Cubic Carbon (C)

Sandstone (Quartz-rich) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

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

Magnetite / Iron Ore

Magnetite (Fe3O4)

Yellow Howlite (Dyed Magnesite/Howlite) (Dyed Ca2B5SiO9(OH)5 (Howlite) or MgCO3 (Magnesite)) — mineral

Yellow Howlite (Dyed Magnesite/Howlite)

Dyed Ca2B5SiO9(OH)5 (Howlite) or MgCO3 (Magnesite)

Black Sand (Magnetite Sand) (Magnetite (Fe3O4)) — mineral

Black Sand (Magnetite Sand)

Magnetite (Fe3O4)

Sandstone (Calcareous Sandstone) (Calcareous Sandstone (primarily SiO2 with CaCO3 cement)) — sedimentary

Sandstone (Calcareous Sandstone)

Calcareous Sandstone (primarily SiO2 with CaCO3 cement)

Gold and Diamond (Native Gold (Au) and Diamond (C)) — mineral

Gold and Diamond

Native Gold (Au) and Diamond (C)

Diamond (Diamond (pure Carbon, C)) — mineral

Diamond

Diamond (pure Carbon, C)

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz in Matrix (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz in Matrix

Silicon Dioxide (SiO2)

Sandstone (Quartz-rich) (Arenite (SiO2)) — sedimentary

Sandstone (Quartz-rich)

Arenite (SiO2)

Limestone (Concretionary or Tufa) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (Concretionary or Tufa)

Calcium Carbonate (CaCO3)

Dyed Agate (Silicon Dioxide (SiO2)) — mineral

Dyed Agate

Silicon Dioxide (SiO2)

Howlite and Purple Amethyst Druzy (Calcium Borosilicate Hydroxide (Howlite) and Silicon Dioxide (Quartz/Amethyst)) — mineral

Howlite and Purple Amethyst Druzy

Calcium Borosilicate Hydroxide (Howlite) and Silicon Dioxide (Quartz/Amethyst)

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

Rough Citrine Quartz

Citrine (Silicon Dioxide, SiO2 with iron impurities)

Yellow Quartz (Citrine/Gold Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine/Gold Quartz)

Silicon Dioxide (SiO2)