Mineral Health

Weathered rock with a tan mineral vein or inclusion

Indeterminate from the photograph; possibly a quartz- or feldspar-rich vein in dark metamorphic host rock

Small tan mineral or rock fragment (unidentified)

Indeterminate from the image; no diagnostic features are visible

Small amber-colored mineral fragment (identity uncertain)

Undetermined; appearance alone is insufficient for a reliable mineral identification

Small cylindrical mineral/stone fragment

Undetermined; the image is insufficient for reliable mineral identification

Quartz-rich granite pebble

Granite, composed mainly of quartz, feldspar, and mica

Small banded metamorphic rock fragment

Indeterminate foliated metamorphic rock; possibly mica schist or gneiss

Fossil shark tooth, likely sand tiger shark

Fossilized selachian tooth; possibly *Carcharias* or *Striatolamia*

Shark Tooth Fossil

Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)

Fossilized Shark Tooth

Chondrichthyes (Class)

Pegmatite (Feldspar and Quartz)

Pegmatite (KAlSi3O8 / SiO2)

Fluorite

Calcium Fluoride (CaF2)

Likely fluorite fragments

Fluorite (calcium fluoride, CaF₂)

Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)

Copper-bearing polymetallic mineral aggregate (Cu-minerals)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Fluorite on Matrix

Calcium Fluoride (CaF2)

Quartz-rich pegmatite (likely feldspar–quartz rock)

Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining

Vesicular basalt (likely iron-rich volcanic rock)

Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine, with iron oxides

Greenstone / Epidosite

Epidosite (primary minerals: Epidote and Quartz)

Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Ironstone / iron-oxide-rich rock fragment

Likely limonite/goethite-rich ironstone; exact identification is not possible from the image alone

Botryoidal chalcedony (likely common opal)

Silica, SiO₂; chalcedony is microcrystalline quartz, while opal is hydrated amorphous silica (SiO₂·nH₂O)

Tumbled basalt pebble

Basalt (fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and iron-titanium oxides)

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Chakra Crystal Bracelet

Mixed Mineral Assortment

River Stone (likely Basalt or Greywacke)

Basalt with mineral veining

Likely granite

Granite, a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar, and mica

Likely granite pebble

Granite, a quartz–feldspar–mica intrusive igneous rock

Granite

Intrusive Igneous Rock

Gneiss

Felsic banded gneiss, chiefly quartz, feldspar, and mica

Weathered granite or granitic gneiss

Quartz–feldspar–mica granitic rock; possible biotite gneiss

Quartz-rich Diorite

Diorite (Phaneritic intermediate igneous rock)

Gneiss

Gneiss

Granodiorite

Granodiorite

Granite fragment

Granite (Felsic intrusive igneous rock)

Gneiss (High-grade Metamorphic Rock)

Gneiss

Granite Cobble

Granite

Granite

Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Gneiss

Gneiss (High-grade metamorphic rock)

Native Copper in Basalt

Cuprum (with Host Basalt)