Metamorphic (Man Made)

Tumbled green-and-white stone, likely serpentine

Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc

Banded gneiss pebble

Foliated gneiss, typically quartz–feldspar–mica bearing

Phyllite (possibly low-grade greenish slate)

Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula

Yellow Quartz (possibly dyed)

Silicon Dioxide (SiO2)

Unidentified gray-green rock, possibly serpentinite or altered basalt

Tentatively serpentinite (serpentine-group minerals), but identification is uncertain from the blurred image

Serpentine with quartz or calcite vein

Serpentinite; mainly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with a pale quartz/calcite vein

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

Red Quartzite Cobble

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Yellow Agate

Agate (Microcrystalline Silicon Dioxide, SiO2)

Gneiss (likely)

Gneiss

Quartz vein rock with iron-stained matrix

Quartz (SiO₂), likely with limonite/goethite and minor feldspar or mica

Serpentine-rich pebble

Serpentinite; chiefly serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite and minor olivine/pyroxene

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Banded gneiss pebble

Gneiss, likely quartz–feldspar–mica gneiss

Quartzite

Quartzite (SiO2)

Tumbled serpentine

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4

Granodiorite

Granodiorite

Citrine (Raw)

Silicon Dioxide (SiO2) with iron impurities

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss

Coquina

Bioclastic Limestone

Weathered gneiss

Banded gneiss, commonly composed of quartz, feldspar, and mica

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and talc

Ruby in Zoisite

Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende

Milky Quartz

Silicon dioxide (SiO2)

Gneiss

Gneiss (pronounced 'nice')

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Serpentine (likely antigorite-rich serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with dark magnetite/chromite or pyroxene inclusions

Quartz

Silicon Dioxide (SiO2)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartzite (Iron-stained)

Quartzite (SiO2 with iron oxides)

Mixed Agate and Lapis Lazuli Bracelet

Chalcedony (SiO2) and Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

Mixed collection of common river stones

Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)