Rock Identifier

Category

Mineral And Glass

Browse mineral and glass specimens identified by the Rock Identifier community.

Learn about Mineral And Glass in the encyclopedia

Sideromelane

Black Obsidian

Maskelynite

Tachylite

Obsidian

Hyalite Opal

Perlite

Opalite

Macusanite

Pink Obsidian

Goldstone

Glauconite

Pale blue-gray quartz-rich pebble (tentative) (Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment) — mineral

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Quartz (specifically Milky Quartz Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Milky Quartz Pebble)

Silicon Dioxide (SiO2)

Green Aventurine (Quartz (SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Orthoclase Feldspar (Orthoclase (KAlSi3O8)) — mineral

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Raw greenish-blue quartz-bearing mineral specimen (Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests) — mineral

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Cullet Glass (Strawberry Glass) (Amorphous Silicon Dioxide (SiO2) with metallic dopants) — Mineraloid (Synthetic/Man-made)

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Mineraloid (Synthetic/Man-made)

Aventurine (Green Quartz) (Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral

Aventurine (Green Quartz)

Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Obsidian with Slate/Tuff (Volcanic glass (SiO2) with associated pyroclastic rock) — igneous

Obsidian with Slate/Tuff

Volcanic glass (SiO2) with associated pyroclastic rock

Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — Igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Obsidian (Obsidian (Volcanic Glass) SiO2 (70% or more)) — igneous

Obsidian

Obsidian (Volcanic Glass) SiO2 (70% or more)

Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Amethyst (Quartz (SiO2)) — gemstone

Amethyst

Quartz (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Muscovite Mica (Muscovite KAl2(AlSi3O10)(OH)2) — mineral

Muscovite Mica

Muscovite KAl2(AlSi3O10)(OH)2

Orthoclase Feldspar (Potassium Feldspar) (KAlSi3O8 (Potassium Aluminum Silicate)) — mineral

Orthoclase Feldspar (Potassium Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions) — igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz with Mineral Inclusions (Silicon Dioxide (SiO2) with accessory minerals) — mineral

Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with accessory minerals

Yellow Quartz (Citrine/Iron-Stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine/Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Jasper Mushroom Carving (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — mineral

Jasper Mushroom Carving

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Slag Glass (Anthropogenic Amorphous Silicon Dioxide) — mineral

Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Tektite (Natural impact glass) — meteorite

Tektite

Natural impact glass

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Snowflake Obsidian (Tumbled) (Obsidian with Cristobalite inclusions) — igneous

Snowflake Obsidian (Tumbled)

Obsidian with Cristobalite inclusions

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz Vein Rock with Feldspar (Silicon Dioxide (SiO2) with Potassium Feldspar) — mineral

Quartz Vein Rock with Feldspar

Silicon Dioxide (SiO2) with Potassium Feldspar

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Sandstone (Sandstone (clastic sedimentary rock)) — sedimentary

Sandstone

Sandstone (clastic sedimentary rock)

Red Sandstone (with possible iron oxide staining) (Sandstone (primarily Quartz with Hematite/Goethite cement)) — sedimentary

Red Sandstone (with possible iron oxide staining)

Sandstone (primarily Quartz with Hematite/Goethite cement)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Opalite (Synthetic glass (SiO2 + metal additions)) — mineraloid

Opalite

Synthetic glass (SiO2 + metal additions)

Quartz (Small Grains) (Silicon Dioxide (SiO2)) — mineral

Quartz (Small Grains)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2) with Hematite/Limonite) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite

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

Smoky quartz (rough, water-worn crystal) (Quartz, silicon dioxide (SiO₂), smoky variety) — mineral

Smoky quartz (rough, water-worn crystal)

Quartz, silicon dioxide (SiO₂), smoky variety