Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Lapis Lazuli

Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Lapis Lazuli

Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli

Na8[Al6Si6O24]S2 (Lazurite component), a rock composed primarily of Lazurite, Calcite, and Pyrite

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Pebble (river rock/beach pebble)

Pebble (clast size class)

Rough Apatite in Matrix

Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Banded river pebble, likely gneiss

Foliated quartz–feldspar rock, possibly banded gneiss

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Greenstone / Greenschist

Greenschist (composed of Chlorite, Epidote, Actinolite)

Sandstone (lithic/greywacke variety)

Arenite (composed primarily of SiO2 with various lithic fragments)

Pink Granite

Phaneritic Igneous Rock (composed of orthoclase, quartz, and mica)

Pink Granite

Phaneritic Plutonic Felsic Rock (Granite)

Stromatolite

Biogenic Sedimentary Rock (composed predominantly of CaCO3)

Lapis Lazuli (Tumbled)

Lazurite-dominated contact metamorphic rock

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Granite

Granite (composed mainly of Quartz, Alkali Feldspar, and Plagioclase)

Mica-rich metamorphic rock (likely mica schist)

Mica schist, composed mainly of muscovite and/or biotite with quartz and possibly feldspar

Mixed River Stones and Minerals

Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)

Green serpentine-rich rock (possibly serpentinite)

Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Granite Core Sample

Granite

Polished gneiss pebble

Quartz–feldspar–mica gneiss (exact mineral identification is uncertain from the image)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Banded gneiss

Gneiss, composed mainly of quartz, feldspar, and mica

Serpentine

(Mg,Fe)3Si2O5(OH)4

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.

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Greenstone

Metabasalt (composed of chlorite, epidote, and actinolite)

Labradorite

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

Gray Slate Pebble

Slate (metamorphosed mudstone/shale)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Unakite

Epidotized Granite

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Unakite

Unakite; epidote–pink feldspar–quartz rock

Pale green-gray stone, possibly serpentinite

Serpentinite (rock composed mainly of serpentine-group minerals)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Weathered iron-stained quartzite or sandstone cobble

Quartzite (quartz-rich rock), possibly ferruginous sandstone