Mineral Specimen

Dark metallic-looking mineral specimen, possibly magnetite

Magnetite (Fe₃O₄), tentative identification

Blue-gray botryoidal mineral specimen

Likely botryoidal chalcedony or hemimorphite; species cannot be confirmed from the image alone

Blue-green mineral specimen, likely amazonite

Amazonite, a green variety of microcline feldspar (KAlSi₃O₈)

Likely raw metallic mineral specimen

Unidentified; possibly galena-bearing ore or magnetite-rich rock

Green copper-bearing mineral specimen, possibly chrysocolla or malachite

Tentatively chrysocolla, hydrated copper aluminosilicate; may include malachite, Cu₂CO₃(OH)₂

Small green mineral specimen, possibly aventurine or serpentine

Uncertain; likely quartz-bearing aventurine (SiO₂) or serpentine-group mineral

Dark metallic mineral specimen, possibly hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing

Tumbled pale-green mineral specimen, likely calcite or prehnite

Probably calcite (CaCO₃) or prehnite (Ca₂Al₂Si₃O₁₀(OH)₂); exact identification requires testing

Quartz-bearing dark mineral specimen, likely schorl tourmaline in quartz

Quartz (SiO₂) with probable schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Small rough mineral specimen, likely quartz-bearing stone

Indeterminate from image; possibly quartz (SiO₂) with iron-oxide staining

Blue-green copper mineral specimen, likely chrysocolla with malachite and quartz

Chrysocolla (hydrated copper aluminum silicate; approximate formula (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), possibly mixed with malachite (Cu₂CO₃(OH)₂) and quartz

Blue-green mineral specimen, likely chrysocolla or turquoise

Chrysocolla: hydrated copper phyllosilicate, approximately Cu₂H₂O₅Si; Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O

Small polished dark mineral specimen

Indeterminate; possibly black tourmaline (schorl) or hematite

Quartz-rich mineral specimen, possibly druzy quartz

Quartz (silicon dioxide, SiO₂), possibly with minor calcite or feldspar

Tumbled pale green mineral specimen, likely calcite

Calcite (CaCO₃), tentative identification

Blue-green copper mineral specimen, likely chrysocolla-bearing rock

Chrysocolla, hydrated copper phyllosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with malachite or chrysocolla matrix

Small polished metallic mineral specimen

Indeterminate from image; possibly galena or hematite

Green glassy mineral specimen, likely nephrite or serpentine

Indeterminate from image; possible nephrite jade (interlocking amphibole, chiefly Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂) or green serpentine (Mg₃Si₂O₅(OH)₄)

Metallic gray mineral specimen, possibly galena or metallic ore

Uncertain from photograph; galena (PbS) is a possibility, but iron sulfide or industrial metal slag cannot be excluded

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Pale green mineral specimen, likely serpentine or chrysoprase

Tentatively serpentine-group mineral (Mg₃Si₂O₅(OH)₄); chrysoprase is an alternative identification (microcrystalline quartz, SiO₂)

Dark green mineral specimen, possibly serpentine or epidote

Tentatively serpentine-group mineral, Mg₃Si₂O₅(OH)₄, or epidote, Ca₂(Al,Fe)₃Si₃O₁₂(OH)

Blue-green glassy mineral specimen, possibly chalcedony or slag glass

Uncertain; candidate minerals include chrysocolla-bearing chalcedony or copper-bearing glassy slag

Tumbled dark metallic mineral specimen

Likely hematite or magnetite; identification is uncertain from the photograph

Green glassy mineral specimen, likely chromium-bearing fluorite (tentative)

Fluorite, CaF₂, possibly green fluorite; identification uncertain from image

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Tumbled blue-gray mineral specimen

Indeterminate; possibly dumortierite quartz, sodalite, or dyed stone

Tumbled blue glassy mineral specimen, possibly blue calcite or dyed quartz

Uncertain from image; likely calcite (CaCO₃) or dyed microcrystalline quartz (SiO₂)

Tumbled pale-green mineral specimen, likely aventurine or serpentine

Quartzite with fuchsite (aventurine) or serpentine-group mineral; exact identification requires testing

Green copper mineral specimen, likely chrysocolla or turquoise

Chrysocolla: hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O

Blue glassy mineral specimen, possibly blue topaz or aquamarine

Tentatively topaz (Al₂SiO₄(F,OH)₂) or beryl/aquamarine (Be₃Al₂Si₆O₁₈); identification is limited by severe image blur

Quartz-rich blue mineral specimen, possibly blue quartz or chrysocolla-bearing quartz

Quartz (SiO₂), with unidentified blue secondary mineral or inclusions

Polished golden mineral specimen, likely golden calcite or citrine quartz

Identification uncertain from the photograph; possibilities include calcite (CaCO₃) or quartz (SiO₂), with the color potentially enhanced by polishing or coating

Small yellow mineral specimen (possibly sulfur)

Unidentified; appearance alone is insufficient to confirm sulfur

Tumbled dark metallic mineral specimen, possibly hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄); visual identification is uncertain

Blue-green glassy mineral specimen, likely aquamarine or pale fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), aquamarine variety; identification is uncertain from the photograph

Mixed rough mineral specimens, likely calcite with prehnite/zeolite

Calcite (CaCO₃), with probable prehnite (Ca₂Al₂Si₃O₁₀(OH)₂) and/or zeolite-group minerals

Mixed rough mineral specimens, likely quartz-bearing rocks

Probable quartz (SiO₂), with possible feldspar, iron oxides, and altered host rock

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Small yellow mineral specimen, possibly sulfur

Unidentified; native sulfur (S) is a possibility

Pale green rough mineral specimen, likely serpentine or calcite

Probable serpentine-group mineral, Mg₃Si₂O₅(OH)₄; possibly pale-green calcite, CaCO₃