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

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

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

Prasiolite (Green Quartz)

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

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

Smoky Quartz Geode Cluster

Silicon Dioxide (SiO2)

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

Smoky Quartz (with possible Garnet inclusions)

Silicon Dioxide (SiO2)

Dyed or treated turquoise-like tumbled stone (Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible) — mineral

Dyed or treated turquoise-like tumbled stone

Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), though blue-green magnesite or howlite imitation is possible

Uraninite (Pitchblende) (Uranium dioxide (UO2)) — mineral

Uraninite (Pitchblende)

Uranium dioxide (UO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Sandstone (Clastic sedimentary rock (primarily Quartz and Feldspar)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar)

Quartz (Yellow/Milky variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Yellow/Milky variety)

Silicon Dioxide (SiO2)

Chert / Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Jasper

Microcrystalline Quartz (SiO2)

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

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

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

Amethyst

Amethyst (Silicon Dioxide - SiO2 with impurities of iron)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst (Tumbled) (Quartz (Silicon Dioxide, SiO2) with iron impurities) — mineral

Amethyst (Tumbled)

Quartz (Silicon Dioxide, SiO2) with iron impurities

Small white mineral fragment (Indeterminate; possibly quartz, calcite, or feldspar) — mineral

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Likely pink feldspar-rich granite or pegmatite (Granite/pegmatite; primarily quartz (SiO₂), alkali feldspar (KAlSi₃O₈), and plagioclase feldspar) — igneous

Likely pink feldspar-rich granite or pegmatite

Granite/pegmatite; primarily quartz (SiO₂), alkali feldspar (KAlSi₃O₈), and plagioclase feldspar

Jasper / Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Jasper / Quartz Pebble

Silicon Dioxide (SiO2)

Beach Pebble (Chalcedony / Chert) (Silicon Dioxide (SiO2)) — mineral

Beach Pebble (Chalcedony / Chert)

Silicon Dioxide (SiO2)

Citrine (Heat-treated Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Jasper and Quartz Pebble (Silicon Dioxide (SiO2) microcrystalline quartz) — sedimentary

Jasper and Quartz Pebble

Silicon Dioxide (SiO2) microcrystalline quartz

Blue Sapphire (Corundum (Al2O3 - Aluminum Oxide)) — mineral

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Black Spinel (Magnesium Aluminum Oxide (MgAl2O4)) — mineral

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Sandstone (Water-worn pebble) (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone (Water-worn pebble)

Sedimentary Rock (Quartz arenite)

Quartz Geode (Silicon Dioxide (SiO2) in sedimentary host rock) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in sedimentary host rock

Herkimer Diamond (Quartz (SiO2)) — mineral

Herkimer Diamond

Quartz (SiO2)

Tumbled yellow quartz (Quartz (SiO₂), likely iron-stained milky quartz or pale citrine) — mineral

Tumbled yellow quartz

Quartz (SiO₂), likely iron-stained milky quartz or pale citrine

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

Citrine Quartz (Tumbled)

Silicon Dioxide (SiO2)

Moonstone (Orthoclase Feldspar (containing Albite lamellae), (KAlSi3O8)) — mineral

Moonstone

Orthoclase Feldspar (containing Albite lamellae), (KAlSi3O8)

Yellow Topaz (Topaz - Al2SiO4(F,OH)2) — gemstone

Yellow Topaz

Topaz - Al2SiO4(F,OH)2

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Silicon Dioxide (SiO2) with Fe3+ impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Amethyst (Silicon Dioxide (SiO2) with trace Iron (Fe)) — mineral

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

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

Amethyst Cluster

Silicon Dioxide (SiO2) with iron impurities

Green Jasper (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Green Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities