Anthropogenic Material (Man Made Rock)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Quartz

Quartz (SiO₂)

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Granite

Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)

Mookaite Jasper

Siliceous sedimentary rock (variety of Jasper/Chert)

Diamond

Diamond (C)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

River Rock (Glacial Cobbles)

Fluvial Alluvium (Mixed lithology including Quartzite, Basalt, and Granite)

Zebra Jasper

Silicon dioxide (SiO2) with various impurities

Soapstone

Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)

Laterite (iron-rich nodule, possibly Bauxite as a subtype)

Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)

Red Granite

Felsic intrusive igneous rock (K-feldspar rich Granite)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O

Conglomerate

Conglomerate

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Chert (Yellow Jasper/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossil Coral

Fossilized Scleractinia or Tabulata (various genera/species)

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Granite

Granite (a common type of Felsic Intrusive Igneous Rock)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Diorite

Diorite

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Quartz (in a rock matrix)

Quartz (SiO2)

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Epidote in Quartz

Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)

Jade

Jadeite or Nephrite

Rose Quartz

Quartz (SiO₂), specifically a variety of Quartz

Granite (Pink/Red variety)

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

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Quartz

Quartz (SiO₂)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Serpentinite

Serpentinite

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

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.