Quartzite pebble
Crystalline silica (SiO2)
metamorphic
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Green Jasper / River Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Dyed Howlite (Purple)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Native Gold in Quartz
Native Gold (Au)
mineral
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Granite
Granite (a felsic intrusive igneous rock)
Igneous
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky or Cloudy)
Silicon Dioxide (SiO2)
mineral
Limestone River Pebble
Calcium carbonate (CaCO3) - micritic limestone
sedimentary
Crushed Limestone
Sedimentary Calcite/Dolomite Rock (CaCO3)
sedimentary
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Banded Agate (Carnelian-Agate)
Silicon Dioxide (SiO2)
mineral
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Agate (Dyed Blue)
SiO2 (Silicon Dioxide)
Mineral (Chalcedony/Quartz variety)
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Greywacke
Lithic Sandstone (Greywacke)
sedimentary
Black Veined Jasper (Spiderweb Jasper)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Not a rock, mineral, or geological specimen
N/A
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Sedimentary
Milky Quartz with Chlorite Schist Inclusions
Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Sandstone Pebble
Sedimentary quartz arenite
sedimentary