Uncertain

Granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Unidentified pale blue-green stone

Not identifiable from this image; possibly amazonite (microcline feldspar)

Fossil-bearing limestone, likely with a shell fossil

Bioclastic limestone, composed mainly of calcite (CaCO₃); fossil appears to be a shell or shell cross-section

Porous volcanic rock, likely scoria

Scoria, a vesicular basaltic to andesitic volcanic rock

Banded fluorite pebble (likely)

Fluorite, CaF₂

Polished peach aventurine or quartz

Likely quartz (SiO₂), possibly feldspar-rich aventurine

Brown chert or jasper fragment

Microcrystalline quartz (SiO₂), likely iron-stained chert/jasper

Likely milky quartz

Quartz, silicon dioxide (SiO₂)

Likely clear quartz fragment

Quartz (SiO₂)

Faceted smoky quartz

Quartz (SiO₂), likely smoky quartz

Tumbled orange-brown stone, likely carnelian or iron-stained chalcedony

Chalcedony (microcrystalline SiO₂), possibly iron-oxide-colored carnelian

Brown chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony

Likely ironstone pebble

Iron-oxide-rich concretion, composed mainly of goethite and/or hematite

Fossil brachiopod shell

Brachiopoda; exact genus and species cannot be determined from the image

Blue-violet faceted gemstone, likely amethyst

Quartz (SiO₂), purple variety colored mainly by iron impurities and irradiation

Granite fragment

Granite; predominantly quartz (SiO₂), feldspar, and mica

Fossil tooth fragment

Likely fossilized shark tooth or marine vertebrate tooth; exact taxon cannot be determined from the image

Greenish translucent glassy mineral specimen, possibly fluorite or quartz

Likely fluorite (CaF₂) or green quartz (SiO₂); exact identification requires hardness and cleavage tests

Likely coarse-grained granite or gneiss

Granite: quartz + feldspar + mica; possibly banded gneiss if metamorphic texture is present

Likely quartz-rich rock or weathered granite fragment

Granite-like quartz–feldspar aggregate; exact identification requires testing

Likely rose quartz

Quartz, SiO₂; crystalline silicon dioxide

Granite (likely)

Granite, a quartz–feldspar-rich intrusive igneous rock

Tumbled orange-brown chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; carnelian is iron-colored chalcedony

Likely dark purple fluorite or another polished mineral specimen

Indeterminate from the image; fluorite is CaF₂

Likely brown chert (flint)

Microcrystalline quartz (SiO₂), variety chert/flint

Rose quartz rough

Quartz, SiO₂ (pink variety commonly called rose quartz)

Calcite crystal specimen

Calcite (CaCO₃)

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Quartz-rich breccia or vein quartz

Quartz (silicon dioxide, SiO₂), likely with iron-oxide staining and other pale gangue minerals

Tumbled green jasper or serpentine

Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄

Brown tumbled stone, likely jasper or iron-rich chert

Microcrystalline quartz (SiO₂), possibly iron-oxide-bearing jasper/chert

Pebble with dark mineral inclusion

Likely granitic or gneissic quartz–feldspar pebble with a mafic inclusion; exact identification requires testing

Tumbled dark limestone or basalt with a pale mineral vein

Likely micritic limestone (calcite, CaCO₃), possibly basalt with a calcite/quartz vein

Fossiliferous limestone

Bioclastic limestone, predominantly calcite (CaCO₃)

Polished agate/geode slice

Chalcedony (microcrystalline quartz, SiO₂), likely agate with an altered druzy/quartz interior

Dark river-worn rock, possibly basalt

Basalt (tentative; visual identification is uncertain)

Likely quartz-rich pebble or pale granite fragment

Uncertain; possibly granite or quartz (SiO₂)

Fossil oyster shell

Ostrea or Exogyra sp. (identification uncertain)

Small dark rock fragment

Uncertain; possibly weathered basalt or slag

Kiwi jasper (sesame jasper)

Trade name for a polished, mottled rock, commonly a mix of quartz/chalcedony and dark amphibole or other inclusions; exact composition cannot be confirmed from the photo.

Tumbled serpentine (likely)

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

Fossilized mammalian tooth fragment

Likely a fossil molar or premolar; exact taxon cannot be determined from the image