Metamorphic (Pseudo Igneous)

Browse metamorphic (pseudo igneous) specimens identified by the Rock Identifier community.

Learn about Metamorphic (Pseudo Igneous) in the encyclopedia

View all →

Cordierite Hornfels

Migmatite

Hornblende Schist

Blue Sapphire

Corundum (Al2O3)

mineral

Pyrite (Iron Pyrite)

Iron Sulfide (FeS2)

mineral

Sapphire

Corundum (Al2O3)

mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Sunstone

Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)

mineral

Smoky Quartz and Clear Quartz Geode

Silicon Dioxide (SiO2)

mineral

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6

mineral

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

sedimentary

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

mineral

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

mineral

Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

mineral

Fluorite

Calcium Fluoride (CaF2)

mineral

Smoky Quartz

SiO2 (Silicon Dioxide)

mineral

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

mineral

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

mineral

Agate

Banded Chalcedony (SiO2 - Silicon Dioxide)

mineral

Peacock Ore (Chalcopyrite/Bornite)

Bornite (Cu5FeS4) or iridescent treated Chalcopyrite (CuFeS2)

Mineral

Quartz (Citrine)

Silicon Dioxide (SiO2)

mineral

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

sedimentary

White Quartz Pebble (with possible Quartz Geode cavity)

Silicon Dioxide (SiO2)

mineral

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

mineral

Smoky Quartz

Smoky Quartz (SiO2 - Silicon Dioxide with aluminum impurities)

mineral

Hematite

Iron(III) oxide (Fe2O3)

mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

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