Sedimentary And Metamorphic

Red Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz

Silicon Dioxide (SiO2)

Mixed mineral and rock collection

Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones

Chalcedony (Agate) Pebble

Silicon Dioxide (SiO2)

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Rounded quartz-rich cobble

Likely quartzite or quartz-rich sandstone; exact identification requires a fresh break or hardness test

Light-colored pebble, likely quartzite or weathered limestone

Indeterminate from image; possible quartzite (microcrystalline SiO₂)

Clear quartz crystals

Quartz (silicon dioxide, SiO₂)

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Native Silver Nugget

Silver (Ag)

Pyrite

Iron Pyrite (FeS2)

Tumbled hematite (likely hematite-rich ironstone)

Hematite, Fe₂O₃; possibly mixed with magnetite or goethite

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Limonite pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Small weathered mineral/rock fragment

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

Green Opal

Hydrated Silica (SiO2·nH2O)

White Quartz Star-cut crystal

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Jasper

Silicon dioxide (SiO2)

Jasper (Red and Yellow)

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Small pale mineral fragment, likely quartz or calcite

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Likely weathered sandstone or metasandstone

Quartz-rich sandstone (possibly weakly metamorphosed metasandstone)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Turquoise (Dyed Howlite/Magnesite imitation)

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

Raw quartz fragment

Quartz (SiO₂), likely milky or included quartz

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered iron-stained quartzite or chert nodule

Siliceous rock composed chiefly of microcrystalline quartz (SiO₂), with iron-oxide staining and possible clay/minor carbonate minerals

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

Quartz-rich rock, possibly quartzite

Quartzite (dominantly quartz, SiO₂); identification is provisional from the photo

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)