Igneous And Mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Blue Sapphire

Corundum (Al2O3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Basalt with Jasper Veining

Basaltic Rock with Cryptocrystalline Quartz (SiO2)

Snowflake Obsidian

Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)

Basalt with Plagioclase Microphenocrysts

Amygdaloidal or Porphyritic Basalt

Basalt with Iron Oxidation (Lattice/Veined)

Mafic Volcanic Rock (principally Plagioclase and Pyroxene)

Granite Pebble

Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)

Granite

Granite (High-silica plutonic rock)

Granite

Granite (a felsic intrusive igneous rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)

Clear Quartz

Silicon Dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Scoria (Vesicular Basalt)

Scoria (Extrusive Igneous Rock)

Diorite (with Iron Staining)

Phaneritic Intermediate Igneous Rock

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss (River Rock/Pebble)

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

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Bumble Bee Jasper

Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

High-grade metamorphic rock (Gneiss)

Pyrite

Iron Sulfide (FeS2)

Arfvedsonite in Matrix

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Rainbow Obsidian

Volcanic Glass (SiO2 + impurities)

Diorite (River Pebble)

Phaneritic Intermediate Plutonic Rock (Diorite)

Celadonite in Amygdaloidal Basalt

K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2 (Celadonite mineral) within a Basalt matrix

Granite

Granite (Phaneritic Acid Igneous Rock)

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Greenstone

Metabasalt / Chlorite-Epidote Schist

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Labradorite

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

Quartz Pebble

Silicon Dioxide (SiO2)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Biotite Mica

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

Clear Quartz

Silicon Dioxide (SiO2)