Mineral Group

Purple quartz fragments, likely amethyst

Amethyst (quartz, SiO₂)

Tiger’s eye

Quartz (SiO₂), pseudomorphic fibrous quartz with crocidolite inclusions

Slate or fine-grained shale

Slate; predominantly quartz, mica, and clay-derived minerals

Black Tourmaline (Schorl)

Schorl (NaFe2+3Al6(BO3)3Si6O18(OH)4)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Serpentinite

Serpentinite (Hydrated magnesium iron phyllosilicate)

Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Polished ammonite fossil

Ammonoidea; likely a Jurassic or Cretaceous ammonite, often sold as Cleoniceras or similar

Green mineral specimen (likely prehnite or chrysoprase)

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

Tumbled chalcedony (likely carnelian or brown agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Yellow chalcedony (likely polished/tumbled pieces)

Microcrystalline quartz, SiO₂; commonly called yellow jasper or silicified limestone depending on exact texture

Quartz with Chlorite / Greenschist

Quartz vein in Greenschist (SiO2 with Chlorite group minerals)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Gabbro

Phaneritic Mafic Igneous Rock

Likely serpentinite (green serpentine rock)

Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)

Gabbro

Phaneritic Basic Igneous Rock

Tumbled serpentine

Serpentinite; chiefly antigorite, lizardite, and/or chrysotile-group minerals

Schorl (Black Tourmaline)

NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Biotite / Black Mica

Biotite K(Mg,Fe)3AlSi3O10(F,OH)2

Basalt with Olivine Phenocrysts

Porphyritic Basalt (Mineral formula of Olivine: (Mg,Fe)2SiO4)

Dalmatian Stone

Dalmatian Stone (a variety of aplite)

Fossilized Gastropod Shell

Gastropoda (Fossilized internal mold or shell body)

Polished brown jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly with iron-oxide impurities

Tumbled pastel gemstone bead strand

Likely dyed or heat-treated quartz/chalcedony varieties, possibly rose quartz, amethyst, and agate

K-Feldspar (Microcline / Orthoclase)

Potassium Feldspar (KAlSi3O8)

Fossil shell fragment, likely brachiopod or bivalve

Indeterminate bioclast; possible Brachiopoda or Mollusca

Biotite Schist

Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Weathered dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, possibly olivine and iron oxides

Polished blue apatite point

Apatite group mineral, commonly fluorapatite (Ca₅(PO₄)₃F)

Radiating stibnite crystals

Stibnite (antimony sulfide, Sb₂S₃)

Fossil shell fragment

Indeterminate marine mollusk shell; likely calcitic or aragonitic shell material (CaCO₃)

Fossilized Bivalve in Limestone

Class Bivalvia within Sedimentary Matrix (likely CaCO3)

Garnet

Garnet Group (e.g., Almandine Fe3Al2(SiO4)3)

Serpentine-rich metamorphic rock

Serpentinite, likely antigorite/lizardite with accessory magnetite or chromite

Serpentine (polished/tumbled piece)

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

Green Calcite

Calcite (CaCO3)

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate Hydroxide - NaFe2+3Al6Si6O18(BO3)3(OH)3OH

Green serpentine-rich rock (possibly serpentinite)

Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Polished serpentine

Serpentinite; chiefly antigorite, lizardite, or chrysotile-group minerals

Tumbled brown jasper

Microcrystalline quartz/chalcedony (SiO₂), commonly iron-oxide stained

Hematite

Iron(III) oxide (Fe2O3)