Mineralological Specimen

Amethyst druzy on agate/geode matrix

Quartz, SiO₂; purple coloration from trace iron and irradiation, with chalcedony (microcrystalline quartz) matrix

Quartz geode or drusy quartz cluster

Quartz (silicon dioxide, SiO₂), likely a quartz-lined cavity in host rock

Quartz-rich conglomeratic sandstone

Lithic arkose/conglomerate, dominated by quartz and feldspar grains

Chert (Jasper and Chalcedony)

Silicon Dioxide (SiO2)

Quartzite with Hematite staining

Quartzite (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Small brown mineral fragment (undetermined)

Unidentified; image detail is insufficient for a reliable species identification

Glauconitic Sandstone (or Greenstone)

Glauconitic Sandstone with Quartz

Common Opal / Chert

Hydrated silica (SiO2·nH2O) or Microcrystalline Quartz (SiO2)

Small dark rock, possibly basalt or a weathered pebble

Unidentified specimen; basalt is a possible visual match, but the image lacks diagnostic detail

Schist

Mica Schist (Metamorphic Rock)

Jasper

Silicon Dioxide (SiO2)

Dark mafic rock, likely basalt

Basalt; primarily plagioclase feldspar, clinopyroxene, and possibly olivine

Rose quartz (rough specimen)

Quartz, SiO₂; pink variety commonly called rose quartz

Rose quartz (rough specimen)

Quartz, SiO₂; pink coloration is commonly attributed to microscopic inclusions or trace elements

Chalcedony

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Polished fossiliferous limestone (likely coral-bearing)

Calcite-rich limestone, primarily CaCO₃; fossil identity is uncertain from the image

Iron-stained quartz vein in host rock

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

Polished garnet bead (likely almandine)

Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)

Banded metamorphic rock, likely gneiss or banded amphibolite

Quartz–feldspar–biotite gneiss or amphibolite; exact identification requires thin-section or mineral tests

Blue-green tumbled mineral specimen

Indeterminate; possibly chrysocolla, turquoise, or azurite–malachite material

Banded gneiss

Quartz–feldspar–biotite gneiss (exact minerals uncertain from the photo)

Iron-oxide-stained jasper or weathered ironstone

Microcrystalline quartz (SiO₂) with hematite/goethite and probable clay minerals

Fossilized coral or carbonate fossil fragment

Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)

Small rounded pebble, likely quartz-rich stone

Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble

Granite (likely a granitic rock)

Granite, composed chiefly of quartz, feldspar, and dark mica or amphibole

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Chert (Agatized)

Silicon Dioxide (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Granite (coarse-grained, mica-bearing)

Granite, composed mainly of quartz, feldspar, and mica (biotite and/or muscovite)

Granite

Coarse-grained felsic intrusive igneous rock, typically quartz + alkali feldspar + plagioclase + biotite/hornblende

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Quartz-rich blue mineral specimen, possibly blue quartz or chrysocolla-bearing quartz

Quartz (SiO₂), with unidentified blue secondary mineral or inclusions

Likely milky quartz with iron-stained and darker mineral inclusions

Quartz, SiO₂; exact specimen identification is uncertain from the photograph

Amethyst (rough specimen)

Quartz, SiO₂; purple color commonly caused by iron-related defects and natural irradiation

Weathered quartz-rich sandstone or granitic rock

Indeterminate; likely iron-stained quartz sandstone, possibly weathered granite

Quartz (Field Specimen)

Silicon Dioxide (SiO2)

Possible green tumbled stone

Unidentified green mineral or rock; the image is too blurred for reliable identification

Quartz (or Chalcedony) Specimen

Silicon Dioxide (SiO2)

Basalt (with possible weathering)

Basalt