Mineral Like Byproduct

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Limonite (Iron Ore)

Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions

Gneiss

Gneiss (High-grade regional metamorphic rock)

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities

Ferruginous Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Limonite

Limonite (Hydrous iron oxides, FeO(OH)·nH2O)

Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH) (Calcium phosphate with Fluorine, Chlorine, or Hydroxyl)

Sandstone

Arenite (SiO2 based with various mineral cements)

Sandstone

Arenite

Silicon Carbide (Carborundum)

Moissanite (SiC), though mostly synthetic

Turquoise in Matrix

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Blue Quartz (potentially Dumortierite-included)

Silicon Dioxide (SiO2) with inclusions

Epidote in Matrix (likely Amphibolite or Gneiss)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Metamorphic Matrix

Green Fluorite

Calcium Fluoride (CaF2)

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Amethyst

Silicon dioxide with iron impurities (SiO2)

Granite

Intrusive Phaneritic Felsic Igneous Rock

Limestone

Calcium Carbonate (CaCO3)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Pink Granite

Felsic intrusive igneous rock (composition: SiO2 and Al2O3)

Prase or Green Quartz

Silicon Dioxide (SiO2 with actinolite or chlorite inclusions)

Granitic Pegmatite

Granite (with coarse-grained Quartz, Feldspar, and Mica components)

Amygdaloidal Basalt with Epidote

Vesicular Basalt with secondary Epidote/Quartz mineral infill

Gneiss

Gneiss

Rhodonite

Rhodonite (Mn, Fe, Mg, Ca)SiO3

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Gneiss (specifically a Granitic Gneiss specimen)

Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)

Petrified Wood

Silicified Wood (SiO2)

Obsidian

Amorphous volcanic glass (SiO2)

Greisen

Greisen

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Schist

Schist (primarily mica-schist)

Quartzite River Rock with Dendrites

Metamorphosed Quartz-rich Sandstone with Manganese Oxide (MnO2) inclusions

Scoria (with Iron Oxidation)

Vesicular Basalt / Scoria