Igneous, Sedimentary, And Metamorphic Mix

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Citrine

Silicon Dioxide (SiO2) with iron impurities

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Zircon

Zirconium Silicate (ZrSiO₄)

Labradorite

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

Smoky Quartz

Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)

Shale

Shale (comprised mostly of clay minerals and quartz)

Quartz (likely macrocrystalline variety)

Quartz (SiO₂)

Mica Schist (Garnetiferous)

Garnet-Mica Schist

Schist

Mica Schist

Blue Kyanite

Kyanite (Al2SiO5)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Quartz (Variety: Rose Quartz/Smoky Quartz mix)

Silicon Dioxide (SiO2)

Granodiorite (Gneissic texture)

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Quartz Geode/Cluster

Quartz (SiO2)

Mica Schist

Mica Schist (Composition: Muscovite, Biotite, Quartz, Feldspar)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Lapis Lazuli

Na6Ca2(Al6Si6O24)(S,SO4,Cl)1-2 (primarily containing Lazurite with inclusions of Calcite and Pyrite)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Muscovite Mica (likely on Quartz/Feldspar)

Muscovite - KAl2(AlSi3O10)(OH)2

Schist

Schist

Dalmatian Stone (often misnamed Dalmatian Jasper)

Aplite (with hornblende/arfvedsonite inclusions)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

Marble

Recrystallized Calcite (CaCO3)

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.

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

Green Calcite

Calcium Carbonate (CaCO3)

Almandine Garnet

Almandine (Fe3Al2Si3O12)

Greenstone (Greenstone River Pebble)

Greenschist (metamorphosed mafic igneous rock)

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Chalcedony

Chalcedony (SiO2)

Phyllite

Phyllite (Foliated metamorphic rock)