Metamorphic Or Sedimentary

Quartz

Quartz (SiO₂)

Garnet (likely Almandine, Pyrope, or a blend)

Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Schist

Mica Schist (primarily consisting of muscovite, biotite, and quartz)

Epidosite (Epidote-rich rock)

Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))

Mica Schist

Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)

Greenschist with Quartz Veining

Greenschist (commonly containing Chlorite, Actinolite, and Epidote)

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.

Blue Sapphire

Corundum (Al2O3)

Gneiss

Gneiss (pronounced 'nice')

Quartzite with Hematite staining

Metamorphic Rock (rich in SiO2)

Schist

Schist (Crystalline metamorphic rock)

Quartzite with Chlorite

Metamorphic Quartzite (SiO2) with phyllosilicates

Schist

Mica Schist (Metamorphic Rock)

Quartzite

Metamorphic Rock (Mainly SiO2)

River Stone (Quartzite)

Metamorphic Quartzite (primarily SiO2)

Quartzite

Metamorphic Quartzite (predominantly SiO2)

Quartzite Pebble (with Iron Inclusions)

Metamorphic Rock (Mainly SiO2)

Pink Quartzite

Silica (SiO2) - Metamorphic rock

Quartzite pebble

Metamorphic rock (mainly SiO2)

Quartzite (River Cobble)

Metamorphic Quartz-rich Rock

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Quartzite

Metamorphic Rock (Mainly SiO2)

Quartzite

Metamorphic rock (primarily SiO2)

Quartzite (with Mica/Feldspar)

Metamorphic Quartzite (SiO2 predominantly)

Orange Quartzite

Metamorphic Quartzite (primarily SiO2)

Quartzite River Stone

Metamorphic Quartzite (primarily SiO2)

Schist

Crystalline Metamorphic Rock (Schistose)

Quartzite pebble

Metamorphic Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Slate

Slate (Foliated metamorphic rock)

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Schist

Crystalline Metamorphic Rock (Schistose)

Mica Schist

Schist (Crystalline metamorphic rock)

Ruby in Fuchsite

Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartzite (River Pebble)

Quartzite (composed primarily of Silica, SiO2)

Mica Schist

Mica Schist (Quartz-Biotit-Muscovite Schist)

Pyrite

Iron Pyrite (FeS2)

Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)

Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)