Mineral (Man Modified)

Quartz crystal cluster (likely druzy quartz)

Quartz, silicon dioxide (SiO₂)

Druzy quartz (quartz-lined rock fragment)

Quartz, SiO₂; likely a druzy coating on a host rock

Milky quartz in iron-stained host rock

Quartz (SiO₂), likely with iron-oxide staining; host rock is uncertain from the photo

Milky quartz (likely quartz-rich specimen)

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, likely milky quartz vein material

Predominantly quartz (SiO₂); exact rock type cannot be confirmed from the photograph

Fossil oyster shell

Fossilized bivalve, commonly Ostrea or Crassostrea

Tumbled quartz fragments, likely rose quartz

Quartz (silicon dioxide, SiO₂), possibly iron- or titanium-tinted rose quartz

Tumbled serpentine

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

Likely petrified wood

Silicified fossil wood, chiefly quartz (SiO₂)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Ironstone concretion

Iron-oxide-cemented sedimentary concretion, commonly hematite/goethite with quartz or clay

Smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), naturally irradiated variety

Tumbled quartz (likely milky or included quartz)

Quartz, silicon dioxide (SiO₂)

Malachite

Malachite — Cu₂CO₃(OH)₂, hydrated copper carbonate

Quartz-rich pegmatite (likely feldspar–quartz rock)

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

Fossil gastropod shell

Gastropoda; species cannot be determined from the image

Ironstone / iron-oxide-rich rock fragment

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

Rock crystal quartz fragment

Quartz (silicon dioxide, SiO₂)

Weathered quartz-rich rock, possibly milky quartz

Quartz (SiO₂); the specimen may be massive vein quartz, but its identity is uncertain from the photo

Quartz-rich rock fragment

Likely quartz vein material, predominantly quartz (SiO₂); identification is tentative from the image

Quartz-rich rock, likely milky quartz vein material

Mostly quartz (SiO₂); exact rock type cannot be determined from the image alone

Quartz geode/druse specimens

Quartz, silicon dioxide (SiO₂), likely iron-stained drusy quartz in a vuggy host rock

Calcite

Calcium Carbonate (CaCO3)

Likely pale green fluorite crystals

Fluorite (calcium fluoride, CaF₂)

Blue chalcedony (likely druzy quartz-bearing rough)

Microcrystalline quartz, SiO₂; possibly quartz with minor iron-oxide inclusions

Blue-green raw mineral specimen, likely apatite

Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)

Stibnite (antimonite)

Stibnite, Sb₂S₃

Clear quartz crystal fragment

Quartz, silicon dioxide (SiO₂)

Basalt

Basalt (Mafic volcanic rock)

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss

Raw green pyrite

Pyrite, FeS₂ (likely nickel-bearing or oxidized greenish pyrite)

Red jasper (likely polished/tumbled)

Jasper, an opaque microcrystalline variety of quartz/chalcedony (SiO₂), colored red by iron oxides

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Vesicular basalt (possibly scoriaceous basalt)

Basalt, chiefly plagioclase feldspar, clinopyroxene, and iron-titanium oxides

Ironstone concretion (possibly limonite/goethite-bearing)

Limonite, a mixture of hydrated iron oxides, commonly including goethite (α-FeO(OH))

Yellow-brown stone or mineral fragment

Unidentified; the image does not show enough detail for a reliable identification

Likely rough quartz with iron-oxide staining

Quartz (SiO₂), possibly with iron-oxide inclusions or surface staining

Milky quartz

Quartz (SiO₂), likely iron-stained or feldspar-bearing

Dark volcanic rock, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine and alteration minerals

Quartz vein material

Quartz (SiO₂), likely milky quartz with iron-oxide staining

Likely sandstone

Quartz-rich sandstone (indeterminate variety)

Tumbled greenstone (likely serpentine or nephrite-like material)

Serpentinite, chiefly serpentine-group minerals; exact identification requires testing