Diamond (in Matrix) rock specimen

Diamond (in Matrix)

Carbon (C)

mineral

Diamond (in a jewelry setting) rock specimen

Diamond (in a jewelry setting)

Cubic Carbon (C)

mineral

Jadeite (Jade) rock specimen

Jadeite (Jade)

Jadeite (NaAlSi2O6)

metamorphic

Nephrite Jade rock specimen

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

metamorphic

Quartz Pebble rock specimen

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Quartz (Milky/Chalcedony variety) rock specimen

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

mineral

Quartz rock specimen

Quartz

Silicon Dioxide (SiO2)

mineral

Quartz rock specimen

Quartz

Silicon Dioxide (SiO2)

mineral

Green Fluorite in Host Rock rock specimen

Green Fluorite in Host Rock

Fluorite (Calcium Fluoride, CaF2)

mineral

Smoky Quartz Geode Slice rock specimen

Smoky Quartz Geode Slice

Silicon Dioxide (SiO2)

mineral

Septarian Nodule (Dragon Stone) rock specimen

Septarian Nodule (Dragon Stone)

Septarian Concretion (CaCO3 - Calcite, Aragonite, and Limestone/Clay)

sedimentary

Banded Agate (Orca Agate) rock specimen

Banded Agate (Orca Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

mineral

Chevron Amethyst rock specimen

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral

Sodalite rock specimen

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral

Unakite rock specimen

Unakite

Epidotized Granite

metamorphic

Red Jasper rock specimen

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions

sedimentary

Tiger's Eye rock specimen

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic

Obsidian rock specimen

Obsidian

Volcanic Glass (70% or more SiO2)

igneous

Chert / Chalcedony rock specimen

Chert / Chalcedony

Silicon Dioxide (SiO2)

sedimentary

Jasper containing epidote (Unakite-like) rock specimen

Jasper containing epidote (Unakite-like)

Epidotized Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

metamorphic

Green Calcite rock specimen

Green Calcite

Calcium Carbonate (CaCO3)

mineral

Milky Quartz rock specimen

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Clear Quartz rock specimen

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Quartz / Milky Quartz rock specimen

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

mineral

Obsidian rock specimen

Obsidian

Obsidian (Extrusive Volcanic Glass)

igneous

Grey Agate (Tumbled) rock specimen

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

mineral

Green Calcite rock specimen

Green Calcite

Calcium Carbonate (CaCO3)

mineral

Satin Spar (often marketed as Selenite) rock specimen

Satin Spar (often marketed as Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

mineral

Orange Calcite with Siderite/Iron Oxide Coating rock specimen

Orange Calcite with Siderite/Iron Oxide Coating

Calcium Carbonate (CaCO3)

mineral

Red Vanadinite on Matrix rock specimen

Red Vanadinite on Matrix

Vanadinite (Pb5(VO4)3Cl)

mineral

Amethyst Cluster rock specimen

Amethyst Cluster

Amethyst (Silicon Dioxide), chemical formula: SiO2

mineral

Titanium Aura Quartz (Aura Quartz) rock specimen

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

mineral

Carnelian Agate rock specimen

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2)

mineral

Black Jasper rock specimen

Black Jasper

Black Jasper (Silicate mineral - SiO2)

sedimentary

Mixed Quartz and River Pebbles (Stone Collection) rock specimen

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

igneous, sedimentary, metamorphic, and mineral

Limestone rock specimen

Limestone

Calcareous sedimentary rock (primarily CaCO3)

sedimentary

Labradorite rock specimen

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

mineral

Chert (specifically Flint or Common Opal/Chalcedony mix) rock specimen

Chert (specifically Flint or Common Opal/Chalcedony mix)

Microcrystalline Quartz (SiO2)

sedimentary

Boulder Opal rock specimen

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Mineral

Banded Agate rock specimen

Banded Agate

Silicon Dioxide (SiO2) - variety Chalcedony

mineral

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye) rock specimen

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

metamorphic

Prehnite rock specimen

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

mineral