Sedimentary To Metamorphic

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Limonite pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Pyrite in Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Small weathered mineral/rock fragment

Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen

Green Opal

Hydrated Silica (SiO2·nH2O)

Quartz-rich rock, possibly milky quartz or quartzite fragment

Quartz (SiO₂), potentially quartzite if metamorphic

Pyrite-bearing rock, possibly pyrite-rich schist or quartzite

Pyrite (iron disulfide, FeS₂) in a fine-grained metamorphic or quartz-rich matrix

Jasper (Green)

Silicon dioxide (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Jasper (Red and Yellow)

Silicon Dioxide (SiO2) with iron oxide impurities

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Pyrite-bearing rock (likely pyrite-rich schist or massive pyrite)

Pyrite, FeS₂, possibly in a micaceous metamorphic matrix

Pyrite-bearing rock

Likely pyrite (FeS₂), possibly with quartz or other sulfide minerals

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / MgCO3 (Magnesite substrate)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

Pink-and-white banded quartzite or jasper

Quartzite, primarily microcrystalline SiO₂, possibly iron-stained quartz/chalcedony

Mixed rock and mineral specimen collection

Varied silicate, carbonate, and oxide minerals; individual identification is not possible from this group photograph

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

SiO2 (Silicon Dioxide)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Weathered brown river pebble, likely sandstone or iron-rich quartzite

Indeterminate; probable quartz-rich sandstone (quartz and iron-oxide cement)

Red Jasper

Jasper (Silicon Dioxide Si₂O₃)

Yellow Jasper

Jasper (Silica-rich Microcrystalline Quartz, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Pale green translucent mineral fragment, likely calcite

Calcite (CaCO₃), tentatively; possibly green fluorite or prehnite

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Pyrite

Iron Sulfide (FeS2)

Gold-colored mineral specimen, likely pyrite or weathered mica schist

Tentatively pyrite (FeS₂); identification is uncertain from the obscured image

Quartz

Quartz (SiO₂ - Silicon Dioxide)