Rock Identifier

Category

Synthetic Or Natural Fiber

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

Basalt (Concrete Aggregate) (Basalt (Mafic volcanic rock)) — igneous

Basalt (Concrete Aggregate)

Basalt (Mafic volcanic rock)

igneous
Basalt (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt

Basalt (Mafic Extrusive Igneous Rock)

igneous
Chrysoprase (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Chrysoprase

Chalcedony (Silicon Dioxide, SiO2)

mineral
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

metamorphic
Granite (Granite (Phaneritic Igneous Rock)) — igneous

Granite

Granite (Phaneritic Igneous Rock)

igneous
Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

sedimentary
Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

mineral
Specular Hematite (Specularite) in Matrix (Specularite (Fe2O3)) — mineral

Specular Hematite (Specularite) in Matrix

Specularite (Fe2O3)

mineral
Fossilized Horn Coral (Order Rugosa (Rugose Coral)) — sedimentary

Fossilized Horn Coral

Order Rugosa (Rugose Coral)

sedimentary
Jade (Jadeite or Nephrite) — Mineral/Mineraloid

Jade

Jadeite or Nephrite

Mineral/Mineraloid
Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

mineral
Turquoise color-bead and Hematite necklace (Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)) — mineral

Turquoise color-bead and Hematite necklace

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

mineral
Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral
Hematite Nodules (Moqui Marbles style) (Iron Oxide (Fe2O3)) — mineral

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

mineral
Chalcopyrite (Chalcopyrite (CuFeS2)) — mineral

Chalcopyrite

Chalcopyrite (CuFeS2)

mineral
Bauxite (Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))) — sedimentary

Bauxite

Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))

sedimentary
Red Jasper (Silicon Dioxide (SiO2) - variety Jasper) — mineral

Red Jasper

Silicon Dioxide (SiO2) - variety Jasper

mineral
Banded Iron Formation (BIF) / Jasper (Banded Iron Formation (SiO2 with Fe2O3 and Fe3O4)) — sedimentary

Banded Iron Formation (BIF) / Jasper

Banded Iron Formation (SiO2 with Fe2O3 and Fe3O4)

sedimentary
Amazonite (KAlSi3O8 (Potassium aluminum silicate - blue-green variety of Microcline)) — mineral

Amazonite

KAlSi3O8 (Potassium aluminum silicate - blue-green variety of Microcline)

mineral
Ocean Jasper (Silicon Dioxide (SiO2) - Orbicular Jasper / Chalcedony) — mineral

Ocean Jasper

Silicon Dioxide (SiO2) - Orbicular Jasper / Chalcedony

mineral
Fire Opal (in Matrix) (Hydrated Silica (SiO2·nH2O)) — mineral

Fire Opal (in Matrix)

Hydrated Silica (SiO2·nH2O)

mineral
Gold Sheen Obsidian (Volcanic Glass (Amorphous Silica with Magnetite inclusions)) — igneous

Gold Sheen Obsidian

Volcanic Glass (Amorphous Silica with Magnetite inclusions)

igneous
Amazonite (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Amazonite

Potassium Aluminum Silicate (KAlSi3O8)

mineral
Chalcedony (Botryoidal/Tumbled Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Botryoidal/Tumbled Agate)

Silicon Dioxide (SiO2)

mineral
Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic
Granite Pebble (Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite Pebble

Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)

igneous
Chevron Amethyst (Silicon Dioxide (SiO2) with Iron impurities) — mineral

Chevron Amethyst

Silicon Dioxide (SiO2) with Iron impurities

mineral
Jasper (Silicon Dioxide (SiO2)) — sedimentary

Jasper

Silicon Dioxide (SiO2)

sedimentary
Milky Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral
Rainbow Moonstone with Black Tourmaline (White Labradorite with Schorl (Na,Ca)(Al,Si)4O8) — mineral

Rainbow Moonstone with Black Tourmaline

White Labradorite with Schorl (Na,Ca)(Al,Si)4O8

mineral
Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

mineral
Chrysocolla (Chrysocolla: Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) — mineral

Chrysocolla

Chrysocolla: Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

mineral
Jasper (Jasper (Silicate - SiO2)) — sedimentary

Jasper

Jasper (Silicate - SiO2)

sedimentary
Red Jasper (Silicon Dioxide (SiO2)) — sedimentary

Red Jasper

Silicon Dioxide (SiO2)

sedimentary
Geode with Quartz/Chalcedony (Silicon Dioxide (SiO2)) — sedimentary

Geode with Quartz/Chalcedony

Silicon Dioxide (SiO2)

sedimentary
Cream Marble (Speckled) (Metamorphosed Limestone (mainly CaCO3)) — metamorphic

Cream Marble (Speckled)

Metamorphosed Limestone (mainly CaCO3)

metamorphic
Jasper (Green/Dragon Blood variety) (Silicon Dioxide (SiO2) with iron/clay inclusions) — sedimentary

Jasper (Green/Dragon Blood variety)

Silicon Dioxide (SiO2) with iron/clay inclusions

sedimentary
Bauxite (Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))) — sedimentary

Bauxite

Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

sedimentary
Tree Agate (also known as Dendritic Agate) (Silicon Dioxide with inclusions (SiO2 + Mn/Fe)) — mineral

Tree Agate (also known as Dendritic Agate)

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

mineral
Quartz on Basalt (Silicon Dioxide (SiO2) on Mafic Igneous Rock) — Mineral on Igneous Rock

Quartz on Basalt

Silicon Dioxide (SiO2) on Mafic Igneous Rock

Mineral on Igneous Rock
Pearl (incorporated into jewelry) (Aragonite and Calcite (CaCO3)) — mineral

Pearl (incorporated into jewelry)

Aragonite and Calcite (CaCO3)

mineral
Larimar (Pectolite (NaCa2Si3O8(OH))) — mineral

Larimar

Pectolite (NaCa2Si3O8(OH))

mineral