Organic Mineral

Note on Image Identification: Textile

N/A (Anthropogenic material)

Brachiopod Fossil

Phylum Brachiopoda (likely Order Rhynchonellida or Spiriferida)

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Limonite (with Pyrite)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Greenstone / Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)

Quartz Pebble

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli

Na8[Al6Si6O24]S2 (Lazurite component), a rock composed primarily of Lazurite, Calcite, and Pyrite

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)

Demitasse Granite (Diorite-Granite transition)

Intermediate Plutonic Rock (Granodiorite/Diorite mix)

Lapis Lazuli

Sodalite-rich metamorphic rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Quartz (Milky/Crystal variety)

Silicon Dioxide (SiO2)

Apatite

Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))

Chrysocolla in Cuprite (Sonoran Sunrise)

Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O) (Chrysocolla) and Cu2O (Cuprite)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Amygdaloidal Basalt

Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)

Granite

Granite (Felsic Plutonic Rock)

Basalt (River Rock/Cobble)

Basalt (no specific mineral formula as it's a rock)

Peridot

Olivine (Mg, Fe)2SiO4

Citrine Quartz

Silicon Dioxide (SiO2)

Precious Opal in Matrix

Hydrated Silica (SiO2·nH2O)

Citrine

Crystalline Quartz (SiO2) with iron impurities

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Olivine in Basalt matrix

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Turquenite (Dyed Howlite)

Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)

Granite Pegmatite

Phaneritic Plutonic Igneous Rock

Tiger's Eye (Brown/Dark variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Quartz Druzy on Matrix (with Copper Mineralization)

Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)

Sandstone (Greywacke/Siltstone variant)

Arenite / Wacke (SiO2 with diverse mineral inclusions)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Vanadinite

Vanadinite (Pb5(VO4)3Cl)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Sandstone

Arenite

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Jasper

Jasper (Silicate mineral, SiO2)

Jasper

Jasper (Silicate mineral, SiO2)