Mineral Precipitate (Anthropogenic Context)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone with Iron Staining

Arenite with Limonite/Hematite inclusions (SiO2 + Fe2O3/FeO(OH))

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Rose Quartz Chips

Quartz (Silicon Dioxide - SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Lepidolite

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

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Veined Basalt River Stone

Basalt with Calcite or Quartz veining

Obsidian

Volcanic Glass (SiO2 rich)

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Moqui Marble (Concretion)

Iron Oxide Concretion (Hematite/Goethite)

Sandstone

Arenite (primarily SiO2)

Azurite and Malachite

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)

Ironstone Concretion (Iron-rich Mudstone)

Siderite / Geothite concretion (FeCO3 / FeO(OH))

Granite

Phaneritic Plutonic Rock (High Silica content)

Bumblebee Jasper

Fibrous Calcite with Arsenic and Sulfur inclusions

Sandstone (with garnet granules)

Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Limonite (Iron Ore)

Hydrated ferric oxide (FeO(OH)·nH2O)

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Pink/Orange Variety)

Silicon Dioxide (SiO2)

Rough Quartz (Alluvial Pebbles)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Quartz (Gravel fragment)

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)

Basalt with Epidote (Flowerstone-like texture)

Amygdaloidal Basalt (silicate mineral inclusions)

Amygdaloidal Basalt

Basalt with secondary mineral infilling

River Pebble (likely Quartzite or Basalt)

Quartzite (SiO2 as primary mineral)

Quartzite

Quartzite (Primary mineral: SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)