Obsidian
Obsidian (Volcanic Glass)
igneous
Category
Mineral (Synthetic Glass)
Browse mineral (synthetic glass) specimens identified by the Rock Identifier community.
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Rounded quartz-rich beach pebble
Likely milky quartz or quartzite (SiO₂)
mineral
Obsidian
Volcanic Glass
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Obsidian
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Green Fluorite (Botryoidal/Massive)
Calcium Fluoride (CaF2)
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
Igneous
Pegmatite (Feldspar and Quartz)
Pegmatite (KAlSi3O8 / SiO2)
igneous
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Vein / Quartz Matrix
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
igneous
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Obsidian
Extrusive igneous volcanic glass (rich in SiO2)
igneous
Obsidian
Extrusive igneous volcanic glass
igneous
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Snowflake Obsidian
Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)
igneous
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Obsidian
Volcanic glass (SiO2-rich extrusive igneous rock)
igneous
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Obsidian
Volcanic glass
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70–75% SiO2)
igneous
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Polished blue-green glassy slag or coated mineral fragment
Most likely man-made colored glass/slag; exact composition cannot be determined visually
mineral
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Milky quartz (likely quartz-rich rock)
Quartz, silicon dioxide (SiO₂)
mineral