Anthropogenic (Man Made Material Processed By Nature)

Quartz

Quartz (SiO2)

Jasper

Silicon Dioxide (SiO2)

Diamond (Rough)

Diamond (C)

Basalt

Basalt (extrusive igneous rock)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Sandstone

Sandstone (clastic sedimentary rock)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Banded Gneiss

Gneiss (pronounced "nice")

Granite

Granite (a felsic intrusive igneous rock)

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.

Clear Quartz (Rock Crystal)

Quartz (SiO₂)

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)

Jasper, microcrystalline quartz (SiO₂)

Serpentinite

Serpentinite

Diamond (Rough)

Diamond (Carbon, C)

Epidote in Quartz

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

Banded Gneiss

Gneiss (pronounced "nice")

Chert (or possibly Flint)

Chert (variant: Flint)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Quartzite

Quartzite (primarily SiO2)

Iron Meteorite

Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Gneiss

Gneiss (pronounced 'nice')

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Calcite

Calcite (CaCO3)

Coal (most likely Bituminous or Anthracite)

Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)

Schist

Schist (various mineral compositions)

Quartz (Float/Abraded)

Quartz (SiO₂)

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Quartz

Silicon Dioxide (SiO₂)

Granite

Granite (a felsic intrusive igneous rock)

Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)

Diorite (Igneous rock, intrusive, intermediate composition)

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Granite

Granite (a felsic intrusive igneous rock)

Diamond

Carbon (C), specifically in an isometric crystal system.

Quartz

Quartz (SiO₂)

Petrified Wood

Silicified wood, primarily composed of Quartz (SiO2)

Pyrite

Iron Pyrite (FeS₂)