Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)

Amber / Copal

Organic resin, C10H16O

Diamond (or Diamond Simulant)

Carbon (C) - Native Element

Halite

Halite (Sodium Chloride, NaCl)

Diamond (or Cubic Zirconia)

Crystallized Carbon (C) for Diamond; Zirconium Dioxide (ZrO2) for CZ

Rhodonite

(Mn,Fe,Mg,Ca)SiO3

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone

Arenite (SiO2 based)

Quartzite

Quartzite (predominantly SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 predominantly)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Granodiorite (foreground) and Rose Quartz (background)

Granodiorite / Quartz (SiO2)

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with miscellaneous inclusions

Silty Shale

Silty Shale (Fissile Sedimentary Rock)

Jasper

Silicon dioxide (SiO2)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Sandstone

Arenite (primarily SiO2)

Milky Quartz with Chlorite/Mica inclusions

Silicon Dioxide (SiO2) with inclusions

Limestone

Calcium carbonate (CaCO3)

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Black Jasper

Jasper (Silicon Dioxide, SiO2)

Amber

Succinite (Organic Gemstone)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Fluorite

Calcium Fluoride (CaF2)

Fluorite (translucent octahedral crystal)

Calcium fluoride (CaF2)

Chalcedony (Botryoidal Agate)

Silicon Dioxide (SiO2)

Pallasite Meteorite

Pallasite (ST-class)

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite

Sandstone (likely Quartz Sandstone)

Arenite (composed primarily of SiO2)

Quartzite pebble

Quartzite (SiO2)

Pyrite

Pyrite (FeS2)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Tree Agate

SiO2

Quartzite

Quartzite (primarily SiO2)