Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock
Browse not a rock specimens identified by the Rock Identifier community.
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Graveler (Fictional Interpretation)
Mons calcarius anthropomorphus
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Gneiss
Gneiss
metamorphic
Pink Granite / Gneiss
Felsic Plutonic Rock (Granite) with Gneissic banding
igneous / metamorphic
Sandstone (Greywacke/Siltstone variant)
Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)
sedimentary
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Brachiopod Fossil (Spiriferid)
Phylum Brachiopoda, Order Spiriferida (CaCO3 - Calcium Carbonate)
sedimentary (fossilized organic remains)
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Milky Quartz (among River Rock)
Quartz (Silicon Dioxide, SiO2)
Mineral
Jasper (with Agate/Chalcedony inclusions)
Silicon Dioxide (SiO2)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Granite
Plutonic felsic igneous rock
igneous
Jasper
Silicon dioxide / Chalcedony (SiO2)
Sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Jasper (Imperial Jasper style)
Silicon Dioxide (SiO2) with impurities
sedimentary
River Stone (likely Quartzite or Chert)
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Tiger's Eye
SiO2 (Silicon Dioxide with inclusions of Goethite/Limonite)
Metamorphic
Granite Gneiss
Felsic Gneiss
metamorphic
Jasper (Red/Yellow)
Silicon Dioxide (SiO2) with impurities
sedimentary
Tiger's Eye (likely Hawk's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
metamorphic
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Jasper
Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)
sedimentary
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Sandstone (with prominent jointing/fractures)
Arenite (composed primarily of SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Riverstone (Quartzite or Siltstone cobble)
Quartzite (primarily SiO2)
metamorphic
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Stiped Slate Beach Pebble
Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
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