Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Metamorphic Pseudomorph)
Browse mineral (metamorphic pseudomorph) specimens identified by the Rock Identifier community.
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Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Garnet in Matrix
Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Garnet Schist
Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)
metamorphic
Fuchsite
Chromium-rich Muscovite Mica
mineral
Granitic gneiss (weathered, rounded cobble)
Foliated granitoid; primarily quartz, feldspar, and mica (composition commonly approximates granite)
metamorphic
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
Banded gneiss (likely amphibolite-bearing gneiss)
Gneiss; quartz–feldspar–mica/amphibole aggregate
metamorphic
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Quartzite with Hematite staining
Quartzite (SiO2)
metamorphic
Garnet Schist
Almandine-bearing Mica Schist
metamorphic
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Yellow Aventurine (Yellow Quartzite)
Silicon Dioxide (SiO2) with inclusions
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica
mineral
Wavellite with Quartz
Al3(PO4)2(OH,F)3 & SiO2
mineral
Schist
Mica Schist
metamorphic
Schist
Mica Schist
metamorphic
Almandine Garnet in Schist
Almandine, Fe3Al2(SiO4)3
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Mica Schist
Mica Schist (Quartz-Mica Metamorphic Rock)
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Chalcopyrite in Quartz matrix
Chalcopyrite (CuFeS2) with secondary Malachite (Cu2CO3(OH)2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Biotite Schist
Schist (Biotite-dominated)
metamorphic
Rhodonite
Rhodonite (MnSiO3)
Mineral
Green Aventurine
Tectosilicate, variety of Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral