Rock Identifier

Category

Tektite (Natural Glass)

Browse tektite (natural glass) specimens identified by the Rock Identifier community.

Learn about Tektite (Natural Glass) in the encyclopedia

Macusanite

Moldavite

Obsidian

Black Obsidian

Green Obsidian

Blue Obsidian

Midnight Obsidian

Maskelynite

Pink Obsidian

Purple Obsidian

Purple Obsidian

Teal Obsidian

Yellow-Green Obsidian

Yellow-Green Obsidian

Aura Quartz (Rainbow Quartz) (Silicon Dioxide (SiO2) with metallic vapor coatings) — mineral

Aura Quartz (Rainbow Quartz)

Silicon Dioxide (SiO2) with metallic vapor coatings

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Milky quartz pebble (Quartz (SiO₂), commonly called milky quartz) — mineral

Milky quartz pebble

Quartz (SiO₂), commonly called milky quartz

Yellow Quartz (Citrine or Quartz Crystal with Iron Inclusions) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Quartz Crystal with Iron Inclusions)

Silicon Dioxide (SiO2)

Sandstone (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)

Sandstone (likely Arkosic or Quartzose) (Sandstone (SiO2 dominated)) — sedimentary

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Tumbled amethyst (Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation) — mineral

Tumbled amethyst

Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation

Quartz (Smoky Quartz / Calcite) (SiO2 (Silicon Dioxide)) — mineral

Quartz (Smoky Quartz / Calcite)

SiO2 (Silicon Dioxide)

Smoky Quartz (Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)) — mineral

Smoky Quartz

Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)

Blue Topaz (Cut Gemstone) (Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)) — gemstone

Blue Topaz (Cut Gemstone)

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz Geode Slice (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz Geode Slice

Silicon Dioxide (SiO2)

Quartz (Citrine / Golden Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine / Golden Quartz)

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

Sandstone (Ferruginous) (Arenite with Iron Oxide cement (SiO2 + Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

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

Sandstone (Banded)

Arenite (primarily SiO2)

Quartz with Tourmaline (Silicon Dioxide (SiO2) with Schorl (Complex Borosilicate)) — mineral

Quartz with Tourmaline

Silicon Dioxide (SiO2) with Schorl (Complex Borosilicate)

Tumbled green aventurine (probable) (Quartz, SiO₂, with green fuchsite mica inclusions) — mineral

Tumbled green aventurine (probable)

Quartz, SiO₂, with green fuchsite mica inclusions

Tumbled milky quartz pebble (Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety) — mineral

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety

Raw Diamond (Rough Uncut) (Diamond (C - pure carbon)) — mineral

Raw Diamond (Rough Uncut)

Diamond (C - pure carbon)

Dyed Pink Quartzite (Jadeite Simulant) (Silicon Dioxide (SiO2) with organic dye) — metamorphic

Dyed Pink Quartzite (Jadeite Simulant)

Silicon Dioxide (SiO2) with organic dye

Quartzite (River Pebbles) (Metamorphosed Sandstone (SiO2)) — metamorphic

Quartzite (River Pebbles)

Metamorphosed Sandstone (SiO2)

Tiger’s eye (Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂) — gemstone

Tiger’s eye

Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂

Smoky Quartz (Silicon Dioxide (SiO2) with aluminum impurities) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Amethyst (with Pyrite and other minerals) (Silicon Dioxide (SiO2)) — mineral

Amethyst (with Pyrite and other minerals)

Silicon Dioxide (SiO2)

Quartzite (Quartzite (chiefly SiO2)) — metamorphic

Quartzite

Quartzite (chiefly SiO2)

Sandstone (Quartzose) (Arenite (composed mainly of SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (composed mainly of SiO2)

Sandstone (likely Arkosic or Quartzose) (Arenite (SiO2 based with mineral inclusions)) — sedimentary

Sandstone (likely Arkosic or Quartzose)

Arenite (SiO2 based with mineral inclusions)

Aquamarine (Beryl (Be₃Al₂Si₆O₁₈), specifically a blue or cyan variety) — Mineral

Aquamarine

Beryl (Be₃Al₂Si₆O₁₈), specifically a blue or cyan variety

Citrine (Quartz (SiO₂)) — Mineral

Citrine

Quartz (SiO₂)

Black Onyx (Cryptocrystalline Quartz (SiO2)) — mineral

Black Onyx

Cryptocrystalline Quartz (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (with inclusions) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (with inclusions)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Polished brecciated jasper (Jasper, opaque microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions) — gemstone

Polished brecciated jasper

Jasper, opaque microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions

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

Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Citrine Quartz (Silicon Dioxide (SiO2) with trace Iron) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with trace Iron

River Quartz (Milky and Smoky mix) (Silicon Dioxide (SiO2)) — mineral

River Quartz (Milky and Smoky mix)

Silicon Dioxide (SiO2)

Tumbled gray feldspar-rich stone, possibly granite or quartzite (Indeterminate; likely quartz–feldspar aggregate, potentially fine-grained granite or quartzite) — igneous

Tumbled gray feldspar-rich stone, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially fine-grained granite or quartzite

Quartz with Iron Staining and Chlorite Inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz with Iron Staining and Chlorite Inclusions

Silicon Dioxide (SiO2)