Mineral

Amygdaloidal Rhyolite (often called Lake Superior Agate relative)

Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Pyrite

Iron Pyrite (FeS2)

Granite

Phaneritic Igneous Rock (Granite)

Aventurine

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Granite

Granite (Felsic Plutonic Rock)

Ferruginous Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)

Granite (Weathered River Rock)

Granite (Phaneritic Igneous Rock)

Sandstone (Micaceous)

Clastic Sedimentary Rock (primarily SiO2 with Mica)

Granite

Granite (High-silica plutonic rock)

Diamond

Diamond (C)

Granite cobble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Granite

Plutonic felsic igneous rock

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (Mafic volcanic rock)

Diamond (in a metal ring setting)

Diamond (Pure Carbon, C)

Quartzite pebble

Quartzite (composed primarily of Quartz, SiO2)

Basalt with Amygdaloidal Infilling

Porphyritic or Amygdaloidal Basalt

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Schist

Mica Schist

Granite (Light-colored quartz/feldspar variety)

Granite (composed primarily of Quartz SiO2 and Feldspar KAlSi3O8)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing mica)

Limonite with Hematite

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)

Pyromorphite on Epidote

Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]

Gneiss (specifically Micaceous Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Gneiss

Gneiss

Quartzite

Quartzite (SiO2)

Fossilized Shark Teeth

Carcharhiniformes or Lamniformes species (common mineral: Fluorapatite/Ca5(PO4)3F)

Gneiss

Gneiss

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Granite

Phaneritic Felsic Igneous Rock

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Quartzite Pebble

Metamorphic Quartz-rich Rock (SiO2)

Basalt (Amygdaloidal)

Amygdaloidal Basalt

Schist

Mica Schist

Schist

Mica Schist

Granite

Granite (Mainly SiO2 and Al2O3)

Granite

Granite (Phaneritic Igneous Rock)