Sunstone
Plagioclase feldspar (with Copper or Hematite inclusions)
mineral
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Amazonite
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone (likely Quartzose)
Sandstone (Principally SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Brecciated jasper/chalcedony (iron-stained silica)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Milky Quartz
Quartz (Silicon Dioxide) - SiO2
mineral
Milky Quartz (Tumbled Pebble)
Silicon Dioxide (SiO2)
mineral
Rhodonite
Manganese Silicate (MnSiO₃)
mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Granite
Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, NaAlSi3O8)
igneous
River Cobble (Quartzite or Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with iron oxide cement Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
River Stone (composed of Siltstone/Basalt mixture)
Siltstone or microcrystalline Basalt pebble
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Petrified Wood
Silicified wood (primarily quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Small rounded pebble, likely quartz-rich river stone
Indeterminate; likely quartz/chert-bearing lithic clast
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone Pebble (River Cobble)
Arenite (Sandstone)
sedimentary
Tumbled brown quartz/chert pebble
Microcrystalline quartz (SiO₂), possibly chert or jasper
mineral
Polished blue agate/geode slice
Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Tumbled blue sodalite (probable)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Yellow Ocher (Iron-rich Silt/Clay)
Goethite-rich Limonite (FeO(OH)qnH2O)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Crushed Stone / Gravel
Aggregate (mixed lithology)
sedimentary
Polished dendritic jasper or agate slab
Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron/manganese dendrites
mineral
Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary