Anthropogenic (Man Made Material Processed By Nature)

Diamond (Rough)

Diamond (Carbon, C)

Conglomerate

Polymictic Conglomerate

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

Jasper, microcrystalline quartz (SiO₂)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Epidote in Quartz

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

Iron Meteorite

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

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Gneiss

Gneiss (pronounced 'nice')

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)

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.

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Schist

Schist (various mineral compositions)

Polished white agate or chalcedony bead

Microcrystalline quartz (SiO₂), likely chalcedony/agate with iron-oxide staining or a brown mineral inclusion

Weathered pegmatite or feldspar-rich granite fragment

Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph

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).

Quartzite

Quartzite (primarily SiO2)

Granite

Granite (a felsic intrusive igneous rock)

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Coal (most likely Bituminous or Anthracite)

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

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)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Quartz (Float/Abraded)

Quartz (SiO₂)

Calcite

Calcite (CaCO3)

Diamond

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

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Quartz

Silicon Dioxide (SiO₂)

Muscovite Mica

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

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Granite

Granite (a felsic intrusive igneous rock)

Petrified Wood

Silicified wood, primarily composed of Quartz (SiO2)

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)

Pyrite

Iron Pyrite (FeS₂)

Chert (or possibly Flint)

Chert (variant: Flint)

Tiger's Eye

Tiger's Eye (a variety of Quartz, SiO₂)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz

Quartz (SiO₂)

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Quartz (SiO₂)

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2