Mineral (Man Modified)

Rough Quartz (likely Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Rainbow Fluorite

Calcium Fluoride (CaF2)

Limonite

Limonite (FeOO·nH2O)

Faceted amber-colored gemstone, possibly citrine

Unidentified transparent gem; citrine is quartz (SiO₂), but the image alone cannot confirm the material

Rose quartz

Quartz, SiO₂ (pink variety)

Polished brown mineral fragment, likely quartz-rich iron-stained material

Possibly quartz (SiO₂) with iron-oxide inclusions; exact identification is uncertain from the image

Serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, olivine, pyroxene, and brucite

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly as crystals in a dark host rock

Blue-gray mineral/rock fragment

Indeterminate; possibly azurite-bearing material, blue chalcedony, or dyed/coated stone

Iron-rich breccia or hematite-bearing ironstone

Hematite–goethite ironstone, possibly brecciated jasper; chiefly Fe₂O₃ and FeO(OH)

Likely dark green-black tumbled stone (possibly serpentine)

Unconfirmed; appearance is consistent with serpentine, a group of hydrated magnesium silicate minerals

Weathered quartz-rich metamorphic rock

Probable quartzite or quartz-rich gneiss; predominantly SiO₂ with feldspar and minor mica/iron oxides

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Multicolor quartz bead bracelet

Quartz (silicon dioxide, SiO₂); bead colors may be from different varieties or treated quartz

Olivine (Peridot)

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

Rose quartz (rough specimen)

Quartz, SiO₂; pink coloration is commonly attributed to microscopic inclusions or trace elements

Limonite (Ironstone Concretion)

Hydrous ferric oxides (FeO(OH)·nH2O)

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

Fluorite

Calcium Fluoride (CaF2)

Anthracite coal

Anthracite; predominantly carbon (C), with minor macerals, ash, sulfur, and trace minerals

Blue-green serpentinite (likely copper-stained)

Serpentinite; chiefly serpentine-group minerals, commonly with malachite/chrysocolla or other copper minerals

Limonite Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Gold Nugget

Native Gold (Au)

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely rose or milky quartz

Serpentine-rich metamorphic rock

Serpentinite; chiefly antigorite/lizardite/chrysotile, commonly with magnetite and carbonate

Red-and-black slate

Slate, a fine-grained metamorphic rock composed mainly of clay-derived mica minerals and quartz

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Blue Topaz

Al2SiO4(F,OH)2

Dyed pink howlite (tumbled stone)

Howlite, Ca₂B₅SiO₉(OH)₅; likely dyed to imitate pink turquoise or rhodonite

Blue-green fluorite (likely tumbled/polished)

Fluorite, calcium fluoride (CaF₂)

Rounded ironstone concretion

Iron-rich sedimentary concretion, commonly composed of goethite and/or hematite cementing sand or clay

Dark, mica-rich metamorphic rock (possibly schist)

Mica schist, tentatively; exact identification is limited by the small, partly obscured specimen

Tumbled pale quartz (possibly milky quartz or calcite)

Quartz, SiO₂; visual identification is uncertain because the specimen is poorly lit and polished

Quartzite or Quartz Vein Material

SiO2

Quartz

Silicon Dioxide (SiO2)

Unidentified dark green rock, possibly serpentinite

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), identification uncertain from the blurred image

Fluorite

Calcium Fluoride (CaF2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Weathered greenish metamorphic rock, likely serpentinite

Serpentinite, dominated by serpentine-group minerals (commonly antigorite, lizardite, or chrysotile)