Mixed (Igneous, Sedimentary, Metamorphic, And Minerals)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Quartz (pebble)

Quartz (SiO₂)

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Milky Quartz

Silicon Dioxide (SiO2)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Pyrite

Pyrite (Iron Disulfide), FeS2

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Quartz

Quartz (SiO2 - Silicon Dioxide)

Magnetite Orthorthotropic Rock

Magnetite (Fe3O4)

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.

Sodalite

Sodalite: Na8(Al6Si6O24)Cl2

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Pyrite in Matrix (Fool's Gold)

Iron Sulfide (FeS2)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Milky Quartz

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)

Rhyolitic Tuff

Rhyolitic Tuff / Pyroclastic rock

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)

Granodiorite

Phaneritic-textured Intrusive Granodiorite

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Orange Calcite

Calcium Carbonate (CaCO3)

Rhodonite

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

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Pink Granite

Phaneritic Quartz-Feldspar Plutonic Rock

Concrete Fragment

Hardened Portland Cement Composite

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Lapis Lazuli

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

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite