Mineral Group

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Amethyst-bearing quartz cluster

Quartz, SiO₂; purple variety: amethyst

Chrysoprase

Silicon Dioxide (Chalcedony variety), SiO2

Microcline (Potassium Feldspar)

Microcline (KAlSi3O8)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)

Polished brown jasper pebble

Jasper, a microcrystalline variety of quartz (SiO₂), typically with iron-oxide inclusions

Garnet Schist

Almandine-Mica Schist

Garnet Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Pyromorphite on Epidote

Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Black Tourmaline (Schorl)

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Almandine Garnet

Almandine [Fe3Al2(SiO4)3]

Rainbow Moonstone (White Labradorite)

White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8)

Milky Quartz with Chlorite inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals

Likely tumbled quartz or feldspar fragment

Quartz (SiO₂) or feldspar-group silicate

Garnet

Garnet group [X3Y2(SiO4)3]

Mica

Mica group (often Muscovite or Biotite)

Garnet

Garnet Group (e.g., Almandine, Pyrope)

Garnet

Garnet group (X3Y2(SiO4)3)

Olivine

Olivine group (Mg, Fe)2SiO4

Red Garnet (Pyrope or Almandine)

Garnet Group (A3B2(SiO4)3)

Garnet (Pyrope-Almandine series)

Garnet Group, (Mg,Fe)3Al2Si3O12

Garnet (Almandine/Pyrope series)

Garnet Group - X3Y2(SiO4)3

Olivine (Peridot)

Olivine Group (Mg,Fe)2SiO4

Garnet

Garnet group [X3Y2(SiO4)3]

Garnet

Garnet group (X3Y2(SiO4)3)

Tumbled blue-green stone, likely turquoise or chrysocolla

Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; chrysocolla: hydrated copper silicate

Tumbled white chalcedony (likely milky quartz)

Chalcedony, cryptocrystalline SiO₂; possibly common quartz or white agate

Likely tumbled or polished jasper/chalcedony

Microcrystalline quartz, SiO₂; possibly opaque jasper or pale chalcedony

Coarse-grained mafic igneous rock, likely gabbro

Gabbro; chiefly calcium-rich plagioclase feldspar and pyroxene, with possible olivine and amphibole

Tiny pale-green mineral fragment

Likely chrysoprase or green quartz; identification is uncertain from the photograph

Polished green stone, likely chrysoprase or aventurine

Chrysoprase: microcrystalline chalcedony (SiO₂) colored by nickel; possible green aventurine: quartz (SiO₂) with fuchsite

Vanadinite

Lead Chlorovanadate, Pb5(VO4)3Cl

Epidote-bearing basalt

Basalt with epidote-group mineral inclusions, likely epidote or pistachite (Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH))

Demitasse Granite (Diorite-Granite transition)

Intermediate Plutonic Rock (Granodiorite/Diorite mix)

Mica Sand / Vermiculite

Phyllosilicate group (typically Biotite or Muscovite)

Black Star Diopside (beads)

Diopside (CaMgSi2O6) - a member of the pyroxene group

Stilbite

Stilbite-Ca (Hydrated calcium sodium aluminum silicate), NaCa4(Si27Al9)O72·28H2O

Vesicular basalt pebble with pale mineral infill

Basalt, likely amygdaloidal basalt; vesicles may contain calcite, zeolite, or silica