Mineral Specimen

Quartz Mineral Specimens

Quartz (Silicon Dioxide, SiO2)

Unidentified small mineral specimen

Undetermined from the image

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Fluorescent glassy mineral specimen, possibly hyalite opal

Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative

Small unidentified mineral specimen

Indeterminate from image; possibly a quartz-family crystal or sulfide mineral

Likely fluorescent mineral specimen

Uncertain; possibly willemite (Zn₂SiO₄) or fluorite (CaF₂)

Mixed mineral specimens, prominently chalcopyrite and amethyst

Chalcopyrite (CuFeS₂) with secondary copper minerals; amethyst, purple quartz (SiO₂)

Uncertain translucent mineral specimen, possibly calcite

Calcite (calcium carbonate, CaCO₃), tentative identification

Uncertain polished mineral specimen

Indeterminate; possibly quartz or feldspar with iron-oxide staining

Brown botryoidal mineral specimen, likely goethite/limonite

Goethite (α-FeO(OH)), possibly mixed with limonite (hydrated iron oxides)

Metallic sulfide mineral specimen, likely pyrite-bearing ore

Likely pyrite (FeS₂), possibly mixed with other sulfides or host rock

Metallic sulfide mineral specimen, likely pyrite

Pyrite (iron disulfide, FeS₂), possibly mixed with marcasite or chalcopyrite

Weathered greenish mineral specimen, possibly serpentine or epidote

Tentatively serpentine-group mineral (Mg3Si2O5(OH)4) or epidote (Ca2(Al,Fe)3Si3O12(OH)); identification is uncertain from the image alone

Likely metallic mineral specimen

Probably galena (lead sulfide, PbS), though visual identification is uncertain

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Mixed rock and mineral specimens

Predominantly quartz-rich rocks, with a possible malachite-bearing specimen; exact identification is uncertain from the image

Tumbled polymetallic mineral specimen, likely chalcopyrite-bearing ore

Probable chalcopyrite (CuFeS₂) with quartz and iron-oxide minerals; exact identification is uncertain from the photograph

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly mixed with marcasite or another iron sulfide

Calcite–fluorite mineral specimen with iron-oxide staining

Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides

Unidentified polished mineral specimen

Indeterminate; likely a pale feldspar or quartz-bearing material

Mixed rock and mineral specimens

Multiple unidentified silicate rocks and minerals; likely quartz-bearing material, feldspar, mica, and iron-oxide-bearing stones

Mixed small mineral specimens

Likely quartz varieties with possible rose quartz and iron-stained quartz; exact identification is uncertain from the blurred image

Likely metallic mineral specimens

Probably native iron or iron oxide/hydroxide material; exact identification requires testing

Mixed rock and mineral specimen collection

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

Fluorescent tumbled mineral specimen, likely calcite

Calcite (calcium carbonate, CaCO₃), probable UV-fluorescent variety

Mixed rock and mineral specimen collection

Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks

Uncertain small mineral specimen, possibly fluorite or quartz-bearing rock

Indeterminate; pale green/purple material may include fluorite (CaF₂) or quartz (SiO₂)

Metallic sulfide mineral specimen, possibly pyrite

Likely pyrite (FeS₂), though the photograph is insufficient for certainty

Small metallic mineral specimen, possibly pyrite

Pyrite (FeS₂), tentative identification

Mixed rock and mineral specimen collection

Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens

Raw dark metallic mineral specimen, possibly native gold-bearing quartz or sulfide ore

Uncertain from image; possible pyrite/chalcopyrite-bearing quartz or gold-bearing sulfide matrix

Likely a small rough mineral specimen

Unidentifiable from the image; possibly a mica-bearing rock or green mineral

Blue-green tumbled mineral specimen

Indeterminate; possibly chrysocolla, turquoise, or azurite–malachite material

Blue-gray mineral specimen (possibly sodalite)

Undetermined; appearance may be consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), but the image is insufficient for reliable identification

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Small brown mineral specimen, possibly mica-bearing rock

Unidentified from the image; exact mineral species cannot be determined at this scale

Likely quartz-rich mineral specimen

Quartz (SiO₂), possibly milky quartz or quartz-bearing rock

Orange-brown tumbled mineral specimen

Indeterminate; possibly iron-stained chalcedony, quartz, or jasper

Blue-green mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Blue crystal/mineral specimen (possibly blue quartz or dyed stone)

Uncertain from photograph; possible quartz, SiO₂, or a blue copper-bearing mineral

Green mineral specimen (likely prehnite or chrysoprase)

Tentatively prehnite, Ca₂Al₂Si₃O₁₀(OH)₂; chrysoprase (microcrystalline quartz) is an alternative

Small dark mineral specimen, possibly hematite or magnetite

Indeterminate from the image; possible hematite (Fe₂O₃) or magnetite (Fe₃O₄)