Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Red Jasper with Quartz Veining
Jasper (Silicon Dioxide, SiO2) with Quartz (SiO2) inclusions
sedimentary
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Jasper (Green Jasper / River Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone
Arenite
sedimentary
Banded Agate (specifically Botswana Agate or Water-line Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Jasper with Quartz Veins
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Tree Agate
Chalcedony with Dendritic Chlorite (SiO2 with impurities)
sedimentary/mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (often composed of Quartz, SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2 with iron oxide inclusions)
metamorphic
Jasper (brecciated or orbicular variety)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Sandstone (Wonderstone)
Arenite with Liesegang rings
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Snowflake Obsidian
Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)
igneous
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartzite Pebbler
Quartzite (SiO2)
metamorphic
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
River Cobble (Quartzite)
Meta-orthoquartzite
metamorphic
Jasper (likely Brecciated or Multi-colored)
Jasper (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (Siliciclastic sedimentary rock)
sedimentary
Hag Stone (Banded Chert or Limestone with Borehole)
Microcrystalline Quartz (Chert) or Calciferous Siltstone (CaCO3/SiO2)
sedimentary
Jasper
Jasper (Cryptocrystalline Quartz; SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
sedimentary
River Rock (Quartz-dominated)
Silicon Dioxide (SiO2) mixture with varied clastic sediments
sedimentary (alluvial deposit)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral