Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
mineral
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
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Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4)
mineral
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)
metamorphic
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Red jasper
Jasper, an opaque microcrystalline quartz variety (SiO₂), colored mainly by iron oxides
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sedimentary Rock Fragments
Clastic Sedimentary Rock
sedimentary
Basalt (Vesicular or Porphyritic River Pebble)
Mafic Volcanic Rock (Aphanitic to Porphyritic Basalt)
igneous
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Unakite
Epidotized Granite
metamorphic
Weathered granite fragment
Granite, primarily quartz, feldspar, and mica
igneous
Quartz Geode
Silicon Dioxide (SiO2) in a sedimentary or volcanic host
mineral
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
River Stone (Sedimentary Sandstone/Quartzite)
Arenite/Quartzite transition specimen
sedimentary
Banded Sandstone Peabble
Arenite with iron oxide banding
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Ironstone / iron-oxide-rich rock fragment
Likely limonite/goethite-rich ironstone; exact identification is not possible from the image alone
sedimentary
Granite
Granite, a coarse-grained intrusive felsic rock composed mainly of quartz, feldspar, and mica
igneous
Weathered quartz-bearing rock
Quartz-rich vein material; likely quartz with iron oxides and feldspar, exact rock type uncertain
mineral
Small rough mineral/rock fragment
Indeterminate; possibly quartz-bearing rock or weathered feldspar
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz geode
Microcrystalline and crystalline quartz, SiO₂, likely with chalcedony and iron-oxide staining
mineral
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Unable to identify - Image contains non-geological items
N/A
Granite (likely weathered granitic rock)
Granite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Quartz geode
Quartz (SiO₂), likely in a chalcedony or other silica-rich host rind
mineral
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary