Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Category
Manufactured Glass
Browse manufactured glass specimens identified by the Rock Identifier community.
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Red Sandstone (with possible iron oxide staining)
Sandstone (primarily Quartz with Hematite/Goethite cement)
sedimentary
Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 cement)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (likely with Quartz Veining)
Arenite (primarily SiO2)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Blue Goldstone
Aventurine Glass
Man-made glass (often grouped with minerals in lapidary)
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
White Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Common Grains)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (SiO2)
mineral
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Goldstone
Aventurine glass (Synthetic glass with copper inclusions)
mineraloid / man-made glass
Red gemstone ring, likely ruby or synthetic ruby
Corundum (Al₂O₃), chromium-colored; natural versus synthetic cannot be determined from the photo
gemstone
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Stamped concrete made to resemble flagstone
Portland-cement concrete with decorative stone-textured finish
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Pink potassium feldspar (likely orthoclase)
Orthoclase, KAlSi₃O₈; possibly intergrown with other feldspars
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Milky Quartz
Quartz (SiO2)
mineral
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Quartz (Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Milk Quartz (Snow Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz arenite)
sedimentary