Mineraloid (Human Made Geological Specimen)

Mineral, specifically a variety of Quartz

Brown Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Pyrite (on Quartz/Sulfide matrix)

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Coquina

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Moss Agate

Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions

Quartz Pebble (Geode-like)

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2 - Silicon Dioxide)

metamorphic

Lapis Lazuli

Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)

Mineral, part of a rock

Quartz (specifically Milky/Yellow Quartz)

Silicon Dioxide (SiO2)

Rough Sapphire

Corundum (Al2O3)

Jadeite

Jadeite (NaAlSi2O6)

metamorphic

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz (Iron-stained or Milky Quartz)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

metamorphic

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Petrified Wood

Silicon Dioxide (SiO2) permineralized organic matter

Orange Calcite

Calcium Carbonate (CaCO3)

Satin Spar (often marketed as Selenite)

Fibrous Gypsum (CaSO4·2H2O)

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (and associated river cobbles)

Silicon dioxide (SiO2)

Amethyst (Purple), Sulfur (Yellow), and Blue Apatite

SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Granite

Granite (Felsic Plutonic Rock)

igneous

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Diamond (Cut Specimen)

Carbon (C)

Dendritic Agate (Tumbled)

Silicon Dioxide (SiO2) with inclusions

Diamond (set in Gold)

Diamond (pure carbon, C)