Mineral (Organic)

Sandstone (Ferruginous)

Arenite (Siliclastic Sedimentary Rock)

Quartz (Milky or Iron-Stained)

Silicon Dioxide (SiO2)

Sandstone (likely Iron-rich or Arkosic)

Arenite (SiO2 with FeO(OH) or Fe2O3 staining)

Sandstone

Arenite (primarily SiO2)

Granite Pebble

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Sodalite

Sodalite: Na8(Al6Si6O24)Cl2

Milky Quartz

Silicon Dioxide (SiO2)

Rhodonite

(Mn,Fe,Mg,Ca)SiO3

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Iron-Stained Quartz (Riverside Cobble)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Gold Ore in Quartz/Schist

Auriferous Quartz and Sulfide-bearing Schist

Pink Marble or Rose Quartz (Likely Pink Marble based on carving texture)

Recrystallized Calcite (CaCO3)

Snowflake Obsidian

Volcanic Glass with Spherulitic Cristobalite (SiO2)

Amazonite

K(AlSi3O8) - Microcline

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)

Banded Gneiss

Gneiss

Malachite

Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Peach Aventurine

Silicon Dioxide (SiO2) with inclusions

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Quartz (Milk Quartz Cobble)

Silicon Dioxide (SiO2)

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals

Rutilated Quartz (with Garnet pendant)

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)

Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein

Arfvedsonite (often mistakenly sold as Astrophyllite)

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

Basalt Porphyry

Porphyritic Basalt

Shale with Iron Oxide Staining

Fissile Mudstone (primarily clay minerals and quartz)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Blue Calcite

Calcium Carbonate (CaCO3)

Sandstone (Quartzose Sandstone)

Arenite

Quartz Druzy on Matrix (likely Agate or Jasper)

Silicon Dioxide (SiO2) with various mineral inclusions

Quartz with Inclusions

Silicon Dioxide (SiO2) with various mineral inclusions

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite and Calcite inclusions

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Graphite

Graphite (Native Carbon, C)

Quartz Pebble

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions