Mineral (Man Made Composite)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Limestone

Calcium Carbonate (CaCO3)

Greenschist

Chlorite Schist

Feldspathic Gneiss (Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz (Fieldstone/Pebble)

Silicon Dioxide (SiO2)

Indigo Gabbro

Gabbro (MaFIC intrusive rock)

Blue Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

Diamond

Carbon (C)

Azurite-Malachite (often called Azerite Malachite or Azurmalachite)

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Beryl (Emerald Variety)

Beryllium aluminum silicate (Be3Al2(SiO3)6)

Sapphirine in Matrix

Sapphirine (Mg,Al)8(Al,Si)6O20

Rough Quartz (with Feldspar inclusions)

Silicon Dioxide (SiO2)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (primarily SiO2)

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Moonstone

Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.

Ironstone Concretion (Coprolite-like)

Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))

Granite

Granitoid (comprised of Quartz, Feldspar, and Mica)

Blue Kyanite

Kyanite (Al2SiO5)

Pyrite and Fluorite on Quartz (Matrix Specimen)

Iron Disulfide (FeS2) and Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Gypsum (Wallboard/Drywall)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Demantoid Garnet on Matrix

Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3

Chalcedony Geode Fragment (Botryoidal)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartzite and Jasper Pebbles

Quartzite (re-crystallized Quartz) and Cryptocrystalline Quartz (SiO2)

Silver (Native Element)

Ag (Native Silver), with minor Copper (Cu)

Citrine Quartz

Citrine (Silicon Dioxide - SiO2)

Kambaba Jasper

Stromatolite / Fossilized Algae (Rhyolitic structure)

Fluorite

Calcium Fluoride (CaF2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Fluorite (often referred to as Rainbow Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Sandstone (with secondary weathering/concretion)

Arenite (composed primarily of Quartz, SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Red Sandstone Pebble

Arenite with Hematite (Fe2O3) cement

Jasper containing epidote (Unakite-like)

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

Garden Quartz (Phantom Quartz)

Silicon Dioxide (SiO2) with various inclusions (often Chlorite, Hematite, or Iron)