Sedimentary Or Metamorphic Derived

Peach Moonstone (Feldspar variety)

Orthoclase Feldspar (KAlSi3O8) with inclusions

Smoky Quartz

Silicon Dioxide (SiO2)

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Moonstone

Orthoclase Feldspar (KAlSi3O8) or Albite mixtures

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Banded Gneiss

Gneiss (pronounced "nice")

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)

Pyrite

Pyrite (FeS2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

Blue Quartzite

Quartzite (specifically a variety enriched with blue-coloring minerals)

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.

Yellow Quartz (Citrine type/Tumbled Quartz)

Silicon Dioxide (SiO2)

Green Banded Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Biotite Mica in Host Rock

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

Moonstone

Orthoclase Feldspar (containing Albite lamellae), (KAlSi3O8)

Quartz (Raw Rose and Milky varieties)

Silicon Dioxide (SiO2)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

Greenstone / Chert

Cryptocrystalline Quartz (SiO2) or Altered Basalt

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Graphite

Graphite (Carbon, C)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Banded Agate (specifically Eye Agate / Chalcedony)

Agate (Cryptocrystalline variety of Quartz, SiO2)

Bull Quartz (White Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon dioxide (SiO2)

Clear Quartz (Rock Crystal)

Quartz (SiO₂)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Sunstone

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