Rock Identifier

Category

Organic (Paper And Cellulose)

Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.

Ruby in Kyanite (Corundum in Disthene (Al2SiO5 + Al2O3)) — metamorphic

Ruby in Kyanite

Corundum in Disthene (Al2SiO5 + Al2O3)

Sandstone (Quartzite-rich River Cobble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich River Cobble)

Clastic sedimentary rock (primarily SiO2)

Granite (Background) and Quartzite/River Pebble (Foreground Heart) (Phaneritic Felsic Igneous Rock (Granite background)) — igneous

Granite (Background) and Quartzite/River Pebble (Foreground Heart)

Phaneritic Felsic Igneous Rock (Granite background)

Amethyst (SiO2 (Silicon Dioxide)) — mineral

Amethyst

SiO2 (Silicon Dioxide)

Sandstone Concretion (Sedimentary concretion) — Sedimentary

Sandstone Concretion

Sedimentary concretion

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Obsidian (Amorphous volcanic glass (SiO2)) — igneous

Obsidian

Amorphous volcanic glass (SiO2)

Chert (Flint variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Yellow Quartz (Citrine or Yellow Jasper) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Yellow Jasper)

Silicon Dioxide (SiO2)

Porcelain Tile (Sandstone-look) (Man-made Ceramic (resembling Quartz-rich Sandstone)) — sedimentary (imitation)

Porcelain Tile (Sandstone-look)

Man-made Ceramic (resembling Quartz-rich Sandstone)

sedimentary (imitation)

Smoky Quartz (Polished) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (Polished)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite (Fe-rich SiO2)) — sedimentary

Sandstone (Ferruginous)

Arenite (Fe-rich SiO2)

Diorite (Diorite (Intermediate Plutonic Rock)) — igneous

Diorite

Diorite (Intermediate Plutonic Rock)

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

Tiger's Eye

Pseudomorph of Macrocrystalline Quartz after Crocidolite (SiO2)

Gneiss (specifically Banded Gneiss) (Gneiss) — metamorphic

Gneiss (specifically Banded Gneiss)

Gneiss

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Olivine ((Mg,Fe)2SiO4 (Magnesium Iron Silicate)) — mineral

Olivine

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

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

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Eclogite (Eclogite (Pyrope-Omphacite rock)) — metamorphic

Eclogite

Eclogite (Pyrope-Omphacite rock)

Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

Quartzite Pebbles (Meta-quartzite (SiO2)) — metamorphic

Quartzite Pebbles

Meta-quartzite (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — metamorphic

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Quartz / River Cobble (Silicon Dioxide (SiO2)) — mineral

Quartz / River Cobble

Silicon Dioxide (SiO2)

Blue Lace Agate (Silicon Dioxide (SiO2)) — mineral

Blue Lace Agate

Silicon Dioxide (SiO2)

Chert (Common Opal/Chalcedony mixture) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Common Opal/Chalcedony mixture)

Silicon Dioxide (SiO2)

Tiger's Eye (Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)) — metamorphic

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

Diabase (also known as Dolerite) (Diabase) — igneous

Diabase (also known as Dolerite)

Diabase

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Almandine Garnet (Almandine, Fe3Al2(SiO4)3) — mineral

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Quartz Sandstone) (Arenite (SiO2 based)) — sedimentary

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Amethyst (Tumbled Chips) (Amethyst (Silicon Dioxide with Iron impurities, SiO2)) — mineral

Amethyst (Tumbled Chips)

Amethyst (Silicon Dioxide with Iron impurities, SiO2)

Chert Breccia (Brecciated Chert (SiO2)) — sedimentary

Chert Breccia

Brecciated Chert (SiO2)

Fulgurite (Fulgurite (Lechatelierite-rich fused silica)) — mineraloid / sedimentary (secondary formation)

Fulgurite

Fulgurite (Lechatelierite-rich fused silica)

mineraloid / sedimentary (secondary formation)

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

Diamond (in jewelry)

Carbon (C)

Quartz Vein in Host Rock (Breccia/Rhyolite) (Silicon Dioxide (SiO2) with matrix) — Mineral in Igneous/Sedimentary host

Quartz Vein in Host Rock (Breccia/Rhyolite)

Silicon Dioxide (SiO2) with matrix

Mineral in Igneous/Sedimentary host

Quartz (Tumbled/Polished Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Tumbled/Polished Pebble)

Silicon Dioxide (SiO2)

Sandstone (with minor quartz and possible clay components) (Clastic Sedimentary Rock (SiO2 dominated)) — sedimentary

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)