Identify any rockfrom a photo.

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