Mineral, Possibly Rock Fragment Containing A Mineral

Pumice

Vesicular Rhyolite or Dacite

Granitic Gneiss

Gneiss (Metamorphic Rock)

Basalt with Garnet inclusions

Basalt containing Nesosilicate (Garnet Group, likely Almandine Fe3Al2Si3O12)

Quartz

Silicon Dioxide (SiO2)

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)

Banded Jasper (Chert)

Silicon Dioxide (SiO2) - variety of Chalcedony

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

White Quartz Pebble (with possible Quartz Geode cavity)

Silicon Dioxide (SiO2)

Sandstone or Mudstone with Iron Staining

Ferruginous Sandstone/Mudstone

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Milky Quartz

Silicon Dioxide (SiO2)

Fossilized Shark Tooth (Fragment)

Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)

Shale or Siltstone

Sedimentary Rock (Siliciclastic)

Bituminous Coal

Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish

Kimberlite with Diamond

Kimberlite (Diamond formula: C)

Turquoise

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

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Serpentine

Serpentine-group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Schist

Mica Schist

Sunstone

Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)

River Pebble (Greywacke or Quartzite-rich Sandstone)

Lithic Sandstone (primarily SiO2 with rock fragments)

Fossiliferous Limestone (Coquina / Shell Limestone)

CaCO3 (Calcium Carbonate)

Peridotite

Ultramafic intrusive rock (Peridotite)

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Quartz Vein in Sedimentary Rock

Silicon Dioxide (SiO2) with host Chert or Limestone

Dinosaur Bone (Fossilized)

Permineralized Bone (CaCO3 or SiO2 after Hydroxylapatite)

Granite

Granite (Phaneritic intrusive igneous rock)

Milky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye (Rough Slab)

Pseudomorph of Quartz after Crocidolite (SiO2 with Fe-containing inclusions)

Red Ochre (Hematite-rich Clay)

Limonitic/Hematitic Claystone (Fe2O3 with clay minerals)

Septarian Nodule (Dragon Stone)

Septarian Nodule (containing Calcite, Aragonite, and Limestone/Clay)

Schist

Schist (various mineral compositions)

Green Calcite

Calcite (CaCO3)

Snowflake Obsidian (or similar porphyritic volcanic rock)

Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)

Quartz

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)