Mineral (Variant Of Quartz)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Water-worn)

Silicon Dioxide (SiO2)

Red Aventurine

Aventurine Quartz (SiO2 + Hematite/Goethite)

Quartzite (Iron-stained)

Quartzite (primarily SiO2)

Citrine

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Strawberry Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Rose Quartz

Silicon dioxide (SiO2)

Yellow Quartz (Chalcedony/Citrine Pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Beach Pebble)

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Rose Quartz

Rose Quartz (SiO2 with traces of Titanium, Iron, or Manganese)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Mica inclusion

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Beach Quartz Pebble

Quartz (Silica - SiO2)

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.

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)

Quartzite

Quartzite (Primary mineral: SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Quartzite with Iron Hydroxide Staining

Quartzite (primarily SiO2) with Limonite/Goethite staining

Clear Quartz

Silicon Dioxide (SiO2)

Granite

Intrusive Felsic Igneous Rock

Granite

Phaneritic Igneous Rock (Granite)

Quartzite with Quartz Vein

Metamorphosed Quartz-rich Arenite (SiO2)

Quartz with Tourmaline Inclusions (Tourmalinated Quartz)

SiO2 with complex borosilicate inclusions

Green Aventurine in Host Rock

SiO2 (Quartz with Fuchsite inclusions)