Sedimentary Or Metamorphic Derived

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Banded Onyx (Green Onyx)

Banded Calcite or Travertine (CaCO3)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (chiefly SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rough Citrine Quartz

Citrine (Silicon Dioxide, SiO2 with iron impurities)

White Marble

Recrystallized Calcite (CaCO3)

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartz Crystal

Quartz (SiO₂)

Pyrite

Pyrite (FeS2)

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Sorosilicate [Ca2Al2Fe3+Si3O12(OH)]

Quartz

Quartz (SiO2, Silicon Dioxide)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Jasper

Jasper / Silicon Dioxide (SiO₂)

Amethyst Geode

Amethyst (Silicon Dioxide), Formula: SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Cluster on Matrix

Silicon Dioxide (SiO2)

Smoky Quartz

Quartz (Silicon Dioxide, SiO2)

Peach Moonstone (Feldspar variety)

Orthoclase Feldspar (KAlSi3O8) with inclusions

Smoky Quartz

Silicon dioxide with aluminum impurities (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Moonstone

Orthoclase Feldspar (KAlSi3O8) or Albite mixtures

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Greenstone / Metagraywacke

Metamorphosed basaltic or sedimentary rock (Complex Silicate)

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.

Quartzite

Quartzite (SiO2)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Sandstone (with potentially metamorphic or basaltic bands)

Arenite / Lithic Wacke

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Quartz

Quartz (SiO₂)

Quartz

Quartz (Silicon Dioxide, SiO2)

Rainbow Moonstone (White Labradorite)

White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8)