Man Made Material (Constructed)

Basalt

Basalt (extrusive igneous rock)

Chert (Flint)

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (predominantly composed of Muscovite or Biotite silicates)

Red Jasper

Jasper (a variety of Quartz, SiO2)

Anthracite Coal

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

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.

Zebra Jasper

Silicon dioxide (SiO2) with various impurities

Diorite

Diorite

Limestone

Calcium Carbonate (CaCO3)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Jasper (Imperial Jasper style)

Silicon Dioxide (SiO2) with impurities

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Greisen (Quartz-Muscovite-Turretine Rock)

Greisen

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Turquoise

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

Charoite

Charoite (Hydrated silicate of potassium, sodium, calcium, barium and strontium): (K,Sr,Ba)(Na,Ca)2[Si4O10](OH,f)·H2O

Rose Quartz

Rose Quartz (SiO₂)

Quartzite

Quartzite (primarily SiO2)

Slag (Industrial Byproduct)

Ferrous/Non-ferrous Silicate

Serpentinite

Serpentinite (Mg, Fe, Ni)₃Si₂O―(OH)₄

Aquamarine

Aquamarine (Beryl variety) - Be3Al2(Si6O18)

Schist

Schist (various compositions)

River Rock

Sedimentary Rock (various compositions)

Schist

Schist

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Basalt

Basalt

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Schist with Quartz/Mica

Mica Schist (primarily Muscovite and Quartz)

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Red Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO₂)

Dog (Sleeping)

Canis familiaris (or Canis lupus familiaris)

Limonite (Iron Ore)

Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)

Tektite (likely Australite)

Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)

Quartzite Pebble

Quartzite (SiO2)

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Bloodstone / Heliotrope

Silicon dioxide (SiO2) with inclusions

Coquina (Fossiliferous Limestone)

Coquina (Organic Clastic Limestone)

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.

Diamond

Diamond (pure carbon; C)