Mineral Based Alloy (Anthropogenic)

Granite

Granite (Felsic Plutonic Rock)

Labradorite

Feldspar (variety of Anorthite), (Ca,Na)(Al,Si)4O8

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Biotite / Black Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide - SiO2)

Bull Quartz (White Quartz)

Silicon Dioxide (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Sandstone (Ferruginous)

Arenite (SiO2 with Iron Oxide impurities)

Conglomerate

Conglomerate (Rock composed predominantly of rounded clasts > 2mm)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Granite

Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Mica Schist

Mica Schist

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with dendritic inclusions

Mica Schist

Mica Schist (Complex Silicate Rock)

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Atlantic Calico Scallop (Biogenic Aragonite/Calcite)

Argopecten gibbus (Chemical: CaCO3)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide

Dendritic Agate (Tree Agate)

Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Ruby

Corundum (Al2O3 with Chromium trace impurities)

Muscovite Mica (Golden/Yellow variety)

KAl2(AlSi3O10)(F,OH)2

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Gneiss (Metamorphic Rock)

Gneiss

Granite (Pink/Red Orthoclase variety)

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)

Greenstone / Diorite

Intermediate plutonic igneous rock

Lepidolite

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

Porphyritic Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Sandstone (likely Siltstone variety)

Arenite / Siltstone (primary mineral SiO2)

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Sandstone (lithic wacke/arenite)

Clastic sedimentary rock (primarily SiO2)

Granite

Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Basalt

Extrusive mafic igneous rock

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Shale

Shale (Consolidated fine-grained clay/silt)

Diorite (River Cobble)

Intermediate plutonic igneous rock