Mineral, Specifically A Rock Fragment

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities like Hematite and Chlorite, SiO2)

Chert (specifically Jasper or Brown Chert node)

Microcrystalline Quartz (SiO2)

Quartzite (specifically a river-worn cobble)

Quartzite (primarily Silicon Dioxide, SiO2)

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Bivalve Fossil (Internal Mold/Steinkern)

Class Bivalvia (Fossilized Mold)

Fossiliferous Limestone (Coquina / Shell Limestone)

CaCO3 (Calcium Carbonate)

Green Calcite

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Bloodstone (Heliotrope)

Chalcedony (SiO2) with inclusions of Iron Oxide or Red Jasper

Chlorastrolite (Isle Royale Greenstone)

Chlorastrolite (Pumpellyite-(Mg,Al)), formula: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2∙H2O

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Orange Calcite (Carved as a Horned Skull)

Calcium Carbonate (CaCO3)

Blue Quartzite

Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite)

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Chert (specifically Yellow or River Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite or Magnetite inclusions, SiO2 (Silicon Dioxide)

Chert (or possibly Flint)

SiO2 (Silicon Dioxide)

Mookaite Jasper

Radiolarite (Silicon Dioxide, SiO2)

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Basalt

Mafic Volcanic Rock

Honey Calcite

Calcium Carbonate (CaCO3)

Labradorite

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

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Blue Lace Agate

Chalcedony (SiO2) with trace minerals

Amazonite

Potassium Feldspar (KAlSi3O8)

Obsidian

Volcanic Glass (SiO2 + minor impurities)

Chert (specifically Flint or Jasper variant)

Cryptocrystalline Quartz (SiO2)

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8) with inclusions

Ruby (Pink to Red Corundum)

Al2O3 (Corundum with Chromium impurities)

Honey Calcite

Calcium Carbonate (CaCO3)

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Greenstone

Greenschist / Greenstone (contains epidote, chlorite, and actinolite)

Green Sandstone

Glauconitic Sandstone

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Green Common Opal

Hydrated Silica (SiO2·nH2O)