Metamorphic Rock (Variety Of Quartz)

Browse metamorphic rock (variety of quartz) specimens identified by the Rock Identifier community.

River Quartz Pitting / Quartzite Pebble

Quartzite (primarily SiO2)

metamorphic

Petrified Wood

Silicified Wood (SiO2)

metamorphic

Ferruginous Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

sedimentary

Blue Tiger's Eye

Crocidolite in Quartz (altered)

Mineral

Rainbow Moonstone with Black Tourmaline

White Labradorite with Schorl (Na,Ca)(Al,Si)4O8

mineral

Agate

Silicon Dioxide (SiO2)

mineral

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

sedimentary

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Sedimentary

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

sedimentary

Quartzite pebble

Quartzite (SiO2 dominated)

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