Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Man Made Glass (Not A Natural Rock Or Mineral)
Browse man made glass (not a natural rock or mineral) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Arkosic or Quartzose)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Druzy on Agate (River Cobble)
Silicon Dioxide (SiO2)
Mineral / Sedimentary (often associated with volcanic hosts)
Snowflake Obsidian
Volcanic Glass (SiO2 with Cristobalite inclusions)
igneous
Green Aventurine
Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Sandstone
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Tumbled quartz-rich stone, possibly blue quartz or granite
Quartz (SiO₂), with probable feldspar and dark accessory minerals
mineral
Amethyst (Purple Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Quartz or Citrine Geode/Cluster
Silicon Dioxide (SiO2)
mineral
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Possible flint or slag fragment
Microcrystalline quartz (chalcedony), or iron-rich industrial slag
mineral
Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Amethyst (Agate/Chalcedony variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartzose Sandstone)
sedimentary
Speckled rounded stone, likely granite or granitic gneiss
Granite/granitic gneiss; primarily quartz (SiO₂), feldspar, and dark mica or amphibole
igneous
Tumbled agate (likely Botswana or fortification agate)
Microcrystalline quartz, SiO₂ (chalcedony with banded impurities)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Tumbled blue stone, likely blue aventurine or dyed quartzite
Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing
mineral
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Quartz Pebble (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide) - SiO2
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 impurities)
sedimentary
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Chert (varieties include Flint)
Sedimentary
Basalt
Basalt
igneous
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary