Metamorphic Rock (Composed Of Multiple Minerals)

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group)

Red Quartzite River Rock

Metamorphic Quartzite (SiO2)

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Gneiss (specifically Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

White-and-dark marble or agate-style gemstone bead bracelet

Likely calcite-rich marble (CaCO₃) mixed with dark gray stone beads; exact material is uncertain from the photo

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Gray Slate Pebble

Slate (metamorphosed mudstone/shale)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartzite Cobble

Quartzite (SiO2)

Quartzite

Quartzite (Metamorphic rock composed primarily of quartz)

Quartzite River Rock

Quartzite (primarily SiO2)

Banded gneiss pebble

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Greenstone / Greenschist

Greenschist (composed of Chlorite, Epidote, Actinolite)

Quartzite River Cobble

Quartzite (primarily SiO2)

Unakite

Unakite; epidote–pink feldspar–quartz rock

Rough Apatite in Matrix

Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Quartzite Cobble

Quartzite (principally SiO2)

Unakite

Unakite (Metasomatized Granite)

Gneiss (specifically a Granitic Gneiss)

Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)

Chlorite-rich schist (probable greenschist)

Chlorite–quartz–mica schist; commonly derived from basalt or shale under greenschist-facies metamorphism

Quartzite Pebble

Quartzite (mostly SiO2)

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Orange Calcite (likely polished specimen)

Calcite

Quartzite (Yellow/Tan)

Metamorphic Rock composed of Quartz (SiO₂)

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Quartzite Pebble

Quartzite (SiO2)

Banded Igneous Dike Rock

Intrusive igneous rock with felsic/mafic banding

Granite / Gneiss (Felsic Metamorphic or Igneous Rock)

Gneiss (or weathered Granite)

Mixed River Stones and Minerals

Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)

Weathered sandstone or metasedimentary rock

Quartz-rich sandstone; possibly weakly metamorphosed quartzite

Greenstone / Greenschist

Greenschist facies metamorphic rock (composed primarily of chlorite, actinolite, and epidote)

Greenstone / Greenschist

Greenschist (composed of Chlorite, Epidote, and Actinolite)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Muscovite Schist

Metamorphic rock primarily composed of quartz and muscovite mica

Quartz Pebble

Silicon Dioxide (SiO2)

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Granite Gneiss

Felsic Gneiss (composed of Quartz, Feldspar, and Biotite)

Quartzite Pebble

Quartzite (primarily SiO2)