Carnelian
Cryptocrystalline Quartz (SiO2)
mineral
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Larimar
Pectolite (NaCa2Si3O8(OH))
mineral
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Sandstone (likely Graywacke or Arkose)
Arenite
sedimentary
Bumblebee Jasper
Fibrous Calcite and Orpiment/Realgar/Pyrite mix
gemstone
Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)
Sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Ametrine
Ametrine (SiO2 - Silicon Dioxide with varied iron impurities)
mineral
Banded Agate (Chert / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Sandstone (Fossiliferous)
Arenite / Clastic Sedimentary Rock
sedimentary
N/A (This is a digital image of a bar graph)
Digital Data Visualization (Bar Chart)
This is not a rock or mineral
Sandstone (Whetstone/Sharpening Stone)
Siliciclastic Sandstone (SiO2 dominant)
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
Granite
Granite (felsic intrusive igneous rock)
igneous
Moss Agate
Chalcedony (SiO2 with inclusions)
mineral
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Jasper (specifically Picture Jasper or Landscape Jasper)
Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz
sedimentary
Fancy Jasper
Silicon Dioxide (SiO₂)
sedimentary
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Stromatolite fossil in Chert/Jasper
Cyanobacteria / Microcystis (fossilized)
fossil
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Labradorite
(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate - CaCO3)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Agate Nodules
Cryptocrystalline Quartz (SiO2)
mineral