Sandstone (Calcareous)
Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
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Unakite
Unakite (metamorphosed granitic rock)
metamorphic
Fossiliferous Sandstone with Plant Remains
Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)
sedimentary
Coarse-grained Granite
Granitoid (Felsic Plutonic Rock)
igneous
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Porphyritic Rhyolite (Birdseye Rhyolite)
Rhyolite (Porphyritic texture)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Slag (Industrial)
N/A (Anthropogenic Slag)
industrial by-product
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Granite
Granite
Igneous
Quartzite Geode or Crystalline Quartz Node
Silicon Dioxide (SiO2)
metamorphic
Jade
Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.
Mineral/Metamorphic Rock (Nephrite or Jadeite)
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite in Conglomerate
Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Likely quartz-rich metamorphic rock (quartzite or milky quartz)
Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining
metamorphic
Sandstone
Arenite
sedimentary
Diamond (Emerald Cut)
Carbon (C)
mineral
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Tumbled agate (probable moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron/manganese dendritic inclusions
mineral
Rough Diamond
Carbon (C)
gemstone
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint) with Glauconite
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz-rich)
sedimentary
Pebble / Rounded Rock
Lithic fragment / Water-worn rock
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartzite / Iron-stained Chert
Silicon Dioxide (SiO2) with Iron Oxide impurities
metamorphic
Gravel / Small Pebble
Rock Fragment (Gravel)
sedimentary