Unknown (Likely Sedimentary Or Metamorphic)

Agate

Silicon Dioxide (Chalcedony), SiO2

Tiger's Eye

Silicon dioxide (SiO2) - Pseudomorph after crocidolite

Agate

Chalcedony (SiO2)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Tumbled green serpentine (probable)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly Mg₃Si₂O₅(OH)₄

Serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with magnetite and minor chromite/talc

Fossil-bearing limestone

Calcite-rich limestone (mainly CaCO₃), with a possible shell fossil

Zoisite with Hornblende

Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions

Pale green rough mineral fragment, likely green fluorite

Fluorite (calcium fluoride, CaF₂) — identification is tentative from the photo

Likely citrine or yellow glass imitation in a silver-tone bracelet

Citrine: quartz, SiO₂; exact material cannot be confirmed visually

Polished serpentine with veined host rock

Serpentine-group minerals, chiefly antigorite/lizardite (Mg₃Si₂O₅(OH)₄)

Serpentine pendant

Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄

Silicified oyster fossil

Fossil oyster shell, commonly Ostrea or Crassostrea, replaced or encrusted by chalcedony/quartz

Turquoise (rough, likely stabilized or treated)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Tumbled amethyst with quartz and likely agate inclusions

Amethyst, purple quartz (SiO₂), with included/mixed quartz; crystalline variety of quartz

Sulfur (native sulfur)

Native sulfur, S₈

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

Charoite

Charoite (Hydrated silicate of potassium, sodium, calcium, barium and strontium): (K,Sr,Ba)(Na,Ca)2[Si4O10](OH,f)·H2O

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chromite, talc, and carbonate

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Agate

SiO2 (Chalcedony/Quartz)

Inlaid turquoise and red-stone earrings

Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O) with an unidentified red inlay; the image does not establish the materials

Quartz crystal cluster

Quartz (SiO₂), likely milky to pale honey-colored macrocrystalline quartz

Pyrite-bearing rock (likely pyrite-rich schist or sulfide ore)

Pyrite (FeS₂) in a fine-grained host rock; exact host cannot be determined from the image

Milky quartz cluster

Quartz (silicon dioxide, SiO₂)

Halite

Sodium Chloride (NaCl)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix

Halite (Rock Salt) Crust

Sodium Chloride (NaCl)

Milky quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Biotite granite (likely weathered granite)

Granite; quartz + feldspar + biotite, with accessory dark minerals

Unidentified gray-brown stone

Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image

Small porous rock (possibly vesicular volcanic rock)

Undetermined; possibly vesicular basalt or scoria

Quartz-bearing granite or pegmatite fragment

Likely granitic material composed mainly of quartz (SiO₂), feldspar, and possibly biotite or hornblende

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Jasper

Silicon dioxide (SiO2) with impurities

Chalcedony (Tumbled Pebble)

Silicon Dioxide (SiO2)

Polished granite (likely a granite countertop or floor slab)

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

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz with iron-oxide staining

Quartz (SiO₂), likely with limonite/goethite staining and possible mica or other dark inclusions

Magnetite or Ironstone Nodule

Magnetite (Fe3O4) or Hematite-rich Sedimentary Nodule