Sandstone
Arenite
sedimentary
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily SiO2)
sedimentary
Concretion
Septarian Concretion (Fragmentary)
sedimentary
Tiger Carving (Banded Onyx or Calcite)
Banded Calcite (CaCO3)
sedimentary
Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Given the appearance, it's likely a fragment of an igneous or metamorphic rock composed of multiple minerals. Without specific diagnostic features, it's difficult to give a common name other than 'crystalline rock fragment'. If pressed to guess based on the granular, somewhat light and dark speckled appearance, it could be a fragment of granite or a related intrusive igneous rock.
As a rock fragment, it does not have a single scientific mineral name; rather, it's a piece of a rock which is a combination of minerals. If it were granite, its main mineral composition would be quartz (SiO2), feldspar (e.g., KAlSi3O8 - orthoclase, (Na,Ca)(Al,Si)4O8 - plagioclase), and mica (e.g., KAl2(AlSi3O10)(OH)2 - muscovite or K(Mg,Fe)3AlSi3O10(OH)2 - biotite), among others.
Mineral, possibly rock fragment containing a mineral
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Banded Calcite (Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Chalcopyrite on Quartz
Copper Iron Sulfide (CuFeS2)
mineral
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Fossil Shark Tooth
Odontaspididae (Sand Tiger Shark family)
fossil
Copper Nugget
Native Copper (Cu)
mineral
Gold Nugget
Gold (Au)
mineral
Native Gold Flake
Gold (Au)
mineral
Chrysocolla in Matrix
Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Bismuth
Bismuth (Bi)
mineral
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
Sandstone
Arenite (SiO2-rich)
sedimentary
Jasper Pendant
Chalcedony (Quartz) - SiO2
Mineral/Sedimentary
Sandstone (Pebble)
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Mosasaur Tooth
Mosasauridae (likely Prognathodon or Enchodus sp.)
fossil
Banded calcite (onyx marble)
Calcite, CaCO₃; commonly sold as “honey onyx” or “Pakistan onyx”
mineral
Pink Quartz / Sea Glass
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Sandstone
Arenite
sedimentary
Slag
Anthropogenic Vitreous Silicate / Ferro-silicate Slag
igneous
Pebble
Lithic fragment (Quartzite or general rock pebble)
sedimentary
Limonite
Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O
mineral
Green Gneiss or Greenschist
Chlorite/Actinolite Gneiss or Schist
metamorphic