Granite

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Unakite

Unakite (Epidotized Granite)

Unakite

Unakite (Epidotized Granite)

Granitic Pegmatite with Tourmaline/Chlorite

Pegmatite

Granodiorite (Cobble/Pebble)

Granodiorite

Granite Cobble

Phaneritic Felsic Intrusive Rock (Granite)

Quartz Chip

Silicon Dioxide (SiO2)

Granodiorite

Phaneritic Plutonic Rock - Granodiorite

Granodiorite Core

Granodiorite

Granodiorite with Biotite Mica

Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite Mica)

Granodiorite Pebble

Granodiorite

Granite Pebble

Granite (Felsic intrusive igneous rock)

Smoky Quartz in Matrix

Silicon Dioxide (SiO2)

Biotite (Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Unakite (Epidotized Granite)

Epidotized Granite (composed of Epidote, Orthoclase, and Quartz)

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Pink Granite

Phaneritic Plutonic Felsic Rock (Granite)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Granite or Granitic Gneiss

Granitoid / Gneiss

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Spessartine Garnet in Quartz/Feldspar Pegmatite

Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar

Granite Cobble

Granite (Felsic Intrusive)

Pink Granite (Crystalline Granite)

Igneous Intrusive Rock (Felsic Plutonic)

Unakite

Unakite (Epidotized Granite)

Unakite

Unakite-Epidote Granite

Unakite

Unakite (Epidotized Granite)

Granodiorite Pebble

Granodiorite

Granodiorite

Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)

Quartz

Silicon Dioxide (SiO2)

Granite Cobble

Phaneritic Felsic Igneous Rock

Labradorite

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

Unakite

Epidote-Feldspar rock (specifically, a variety of granite)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2

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.

Feldspar (Orthoclase)

Potassium Feldspar (KAlSi3O8)

Quartz

Silicon Dioxide (SiO2)

Smoky Quartz with Feldspar

Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)

Diorite

Diorite (an intrusive igneous rock)

Granite Water-Worn Pebble

Phaneritic Felsic Igneous Rock (Granite)

Unakite (or Epidote-rich Granite)

Unakite (Metamorphosed Granite consisting of Epidote, Orthoclase, and Quartz)

Granite River Cobble

Phaneritic Felsic Igneous Rock

Pink Granite Pebble

Granite (Phaneritic igneous rock)