Mineraloid (Human Made Geological Specimen)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Quartz

Silicon dioxide (SiO2)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Azurite Malachite (Mixed)

Azurite-Malachite; Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2

Coquina

Coquina (Biogenic Limestone / CaCO3)

Jasper (Cream/Yellow variety)

Silicon dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide (Fe2O3) cement

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Rough Diamond

Diamond (pure Carbon, C)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moonstone

Adularia (Potassium Aluminum Silicate, KAlSi3O8)

Gold Ore in Quartz

Auriferous Quartz (Gold: Au; Quartz: SiO2)

Jasper

Jasper (Cryptocrystalline variety of Quartz, SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Quartz-veined Basalt

Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein

Basalt

Basalt (Mafic volcanic rock)

Magnetite (potentially Hematite-rich)

Magnetite (Fe3O4)

Quartz Pebble (with potential iron inclusions)

Silicon Dioxide (SiO2)

Quartz (Microcrystalline/Macro crystalline variety)

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Epidote

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Quartz Geode (Druzy)

Crystalline Silicon Dioxide (SiO2)

Quartz (Fieldstone/Pebble)

Silicon Dioxide (SiO2)

Fuchsite (Green Muscovite in Quartz)

K(Al,Cr)2(AlSi3O10)(OH)2 - Chromium-rich Muscovite

Blue Calcite

Calcium Carbonate (CaCO3)

Amber (Copal)

Organic gemstone, fossilized tree resin (often immature amber or copal)

Limonite (Ironstone Concretion)

Limonite (Hydrous Ferric Oxides mixed with Goethite)

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Unidentified Rock Fragment

Unknown

Quartz (Sand Grain size)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic Terrigenous Sedimentary Rock (primarily SiO2)

Epidote Water-Worn Pebble

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

White Marble

Recrystallized Calcite (CaCO3)