Metamorphic Rock (Composed Of Multiple Minerals)

Weathered sandstone fragment

Quartz-rich sandstone, possibly ferruginous sandstone

Serpentinite (Polished Egg)

Serpentinite (composed mainly of serpentine group minerals, Mg3Si2O5(OH)4)

Polished red jasper pendant

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group: Chrysotile, Lizardite, and Antigorite)

Mica Schist

Schist

Mixed Mineral Collection

Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)

Gneiss

Gneiss

Lapis Lazuli

Lapis Lazuli (Complex rock mainly composed of Lazurite, Calcite, and Pyrite)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Serpentinite

Serpentinite, a rock composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)

Tumbled brown quartzite pebble

Quartzite, composed predominantly of microcrystalline quartz (SiO₂)

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Bauxite (Laterite)

Hydrated aluminum oxides (Al2O3·nH2O)

Magnetite

Fe3O4 (Iron(II,III) oxide)

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Likely slate fragments

Slate, a fine-grained metamorphic rock composed chiefly of quartz, mica, and chlorite

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)

Serpentine-rich rock (likely antigorite serpentinite)

Serpentinite, composed mainly of serpentine-group minerals such as antigorite, lizardite, or chrysotile

Bauxite

Bauxite (Aluminum Ore)

Chalk (or Soapstone Marking Stick)

Calcium Carbonate (CaCO3) / Hydrous Magnesium Silicate (Mg3Si4O10(OH)2)

Granite Pebble

Granite (Phaneritic Quartz-Feldspar Rock)

Banded gneiss (likely granitic gneiss)

Foliated gneiss composed mainly of quartz, feldspar, and dark biotite/amphibole

Granite / Quartz with Mica inclusion

Granite (Plutonic Igneous Rock)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Mixed river pebbles (gravel)

Polymictic alluvial gravel; diverse clasts, likely including quartz, feldspar-rich granitoids, and metamorphic rocks

Tumbled purple stone, likely amethyst-bearing quartzite or dyed quartz

Quartz (SiO₂), possibly microcrystalline quartzite; purple color may be from iron-related amethyst or artificial dye

Polished unakite

Unakite; altered granite composed mainly of epidote, pink potassium feldspar, and quartz

Mixed rock and mineral specimens

Multiple unidentified silicate rocks and minerals; likely quartz-bearing material, feldspar, mica, and iron-oxide-bearing stones

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Green schist (probable chlorite–actinolite schist)

Chlorite–actinolite schist; commonly composed of chlorite, actinolite, epidote, albite, and quartz

Sandstone

Arenite (Sedimentary Rock)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Weathered dark volcanic rock, likely basalt

Basalt; fine-grained mafic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Weathered conglomeratic river pebble

Polymictic conglomerate, likely ferruginous chert/sandstone matrix

Greenstone (likely serpentine-rich rock)

Serpentinite, a rock composed mainly of serpentine-group minerals; exact identification is uncertain from the image

Greenstone / Serpentinite

Serpentinite (composed largely of Serpentine group minerals, Mg3Si2O5(OH)4)

Rounded greenish metamorphic rock, likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile)

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), possibly with minor feldspar, mica, or iron oxides

Sandstone

Arenite

Blue sodalite-bearing rock, possibly lapis lazuli

Sodalite (Na₈Al₆Si₆O₂₄Cl₂), likely in a feldspathoid-rich aggregate