Mineral (Tectosilicate)

Yellow Calcite

Calcium Carbonate (CaCO3)

Blue Chalcedony

Silicon Dioxide (SiO2)

Yellow Aventurine

Quartz (Silicon Dioxide - SiO2) with inclusions of Mica

Nephrite Jade

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

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Sandstone

Arenite (SiO2 based)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Sandstone

Arenite (composed primarily of SiO2)

Blue Quartz (Dumortierite Quartz)

Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)

Orange Calcite

Calcium Carbonate (CaCO3)

Satin Spar Selenite

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Agate (specifically Carnelian Agate)

Silicon dioxide (SiO2) - Chalcedony variety

Sandstone

Arenite (primarily SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt

Sphalerite in Matrix (Polished Point)

Zinc sulfide (Zn,Fe)S

Sulfur

Native Sulfur (S8)

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Milky Quartz Geode with Chlorite

Silicon Dioxide (SiO2) with Chlorite group inclusions

Granite (with Beryl/Aquamarine)

Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)

Raw Diamond (Rough Uncut)

Diamond (C - pure carbon)

Milky Quartz (Water-Worn Cobble)

Silicon Dioxide (SiO2)

Meteorite (Chondrite)

Stony Meteorite (Ordinary Chondrite)

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Schist

Mica Schist (Quartz-Muscovite-Biotite Schist)

Calcite

Calcite (CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Bauxite (Concretionary)

Bauxite (Al(OH)3, AlO(OH))

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous matrix

Milky Quartz Pebble with Chert

Silicon Dioxide (SiO2)

Quartz (Chert/Chunky Chalcedony)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Fluorite

Calcium Fluoride (CaF2)

Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)

Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)

Dendritic Siltstone (or Mudstone)

Siltstone with Manganese Oxide dendrites

Quartz (Milky/Clear Variety)

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Mixed Quartz and Jasper Pebbles

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Potassium Feldspar (Orthoclase)

KAlSi3O8