All rocks & minerals

Likely sodalite (rough blue specimen)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Dark gray shale or slate-like rock

Fine-grained, clay-rich mudrock; exact identification is uncertain from the photo

Milky quartz

Quartz (silicon dioxide, SiO₂)

Chevron amethyst point

Quartz (SiO₂), purple amethyst with pale quartz bands

Diamond jewelry setting

Diamond (crystalline carbon, C) in a metal setting; the small stones’ identity is not visually confirmable

Likely feldspar (weathered, cleaved fragment)

Probably potassium feldspar, KAlSi₃O₈ (orthoclase or microcline); identification from the photo is provisional.

Pink quartzite (likely iron-stained)

Quartzite, composed predominantly of quartz (SiO₂)

Iron-stained quartz-rich rock, possibly quartz vein material

Quartz-rich vein rock with iron oxides/hydroxides (quartz, Fe₂O₃/FeO(OH)); exact identification requires testing

Water-worn quartzite pebble

Quartzite, composed predominantly of quartz (SiO₂)

Quartz-rich rock, likely milky quartz vein material

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

Milky quartz

Quartz (SiO₂)

Gray quartz pebble or fragment

Quartz (SiO₂)

Likely calcite crystal

Calcite (CaCO₃)

Granite with a quartz-rich inclusion

Granite, composed chiefly of quartz, feldspar, and mica; the visible inclusion appears to be milky quartz

Granite with a quartz-rich inclusion

Granite, composed mainly of quartz, feldspar, and mica

Milky quartz in a granitic rock

Quartz (SiO₂), hosted in likely granite or granitic gneiss

Quartz crystal on granite

Quartz, SiO₂; host rock is likely coarse-grained granite

Likely rose quartz

Quartz, SiO₂ (pink variety)

Possible pink quartz specimen in a dark matrix

Uncertain from the image; possibly rose quartz (SiO₂) attached to a dark host rock

Unidentified small white mineral fragment, possibly quartz

Unconfirmed; quartz (SiO₂) is a plausible visual match

Likely quartz (possibly milky quartz) in a dark host rock

Quartz, SiO₂; the dark host is not identifiable from this image

Likely rose quartz in a dark matrix

Quartz, SiO₂; the host rock cannot be identified from this photo

Weathered fossil-bearing pebble, possibly fossiliferous limestone

Fossiliferous carbonate rock; exact fossil and rock identification are not certain from the photograph

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Orange calcite (rough fragment)

Calcite, CaCO₃

Turquoise-colored rough specimen, possibly dyed howlite or magnesite

Unconfirmed; turquoise is CuAl₆(PO₄)₄(OH)₈·4H₂O, while common turquoise imitations include dyed Ca₂B₅SiO₉(OH)₅ (howlite)

Rainbow aura quartz (treated quartz crystal)

Quartz, SiO₂, with a thin artificial metal-oxide coating

Blue kyanite

Kyanite (Al₂SiO₅)

Green mica schist (probable)

Mica-rich schist, likely dominated by muscovite or chlorite with quartz

Milky quartz-rich rock (likely quartzite)

Quartzite, composed predominantly of quartz (SiO₂); identification is tentative from the image

Quartz vein rock (likely iron-stained milky quartz in host rock)

Predominantly quartz (SiO₂), with rusty iron-oxide staining and possible feldspar/host-rock fragments

Botryoidal quartz on matrix

Quartz, SiO₂, with possible iron-oxide-stained host rock

White Marble

Metamorphosed limestone (primarily Calcite, CaCO3)

Rounded quartzite pebble

Quartzite, composed predominantly of quartz (SiO₂)

Green fluorite (rough crystal aggregate)

Fluorite, CaF₂

Small tumbled pale quartz pebble

Quartz (silicon dioxide, SiO₂)

Small rounded river pebble, possibly fine-grained quartzite

Unidentified silicate pebble; quartzite is a tentative visual identification

Tumbled agate (likely orbicular or plume agate)

Microcrystalline quartz, SiO₂, with chalcedony banding and inclusions

Tumbled milky quartz pebble

Quartz (SiO₂)

Weathered reddish-brown rock, possibly sandstone

Likely iron-oxide-stained quartz-rich sandstone; exact identification is uncertain from the photo

Granite

Granite, a coarse-grained intrusive felsic igneous rock composed chiefly of quartz, feldspar, and mica

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)