Metamorphic Rock (Composed Of Multiple Minerals)

Black slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals, chlorite, and quartz

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Dragon Blood Jasper (Dragon Stone / Epidote-Piemontite/Jasper rock)

Epidote with Piemontite / Chalcedony aggregate

Biotite-bearing gneiss (probable)

Foliated metamorphic rock composed chiefly of quartz, feldspar, and dark biotite/amphibole

Granite Pebble

Phaneritic intrusive igneous rock

Likely serpentinite pebble

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the image is uncertain

Schist

Schist; commonly mica schist, composed chiefly of muscovite/biotite mica with quartz and feldspar

Granite

Granite (Phaneritic intrusive igneous rock)

Slate

Foliated Metamorphic Rock (primarily composed of Muscovite, Chlorite, and Quartz)

Slate

Metamorphic Rock (Fine-grained)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, e.g., Lizardite, Chrysotile, Antigorite)

Serpentinite

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

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Red-and-gray granitic gneiss

Gneiss, composed mainly of quartz, feldspar, and mica with iron-oxide staining

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Agate Geode / Nodular Chalcedony

Silicon Dioxide (SiO2) with impurities

Chert with Calcite Veins

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions

Mica schist

Muscovite–biotite schist, composed mainly of mica and quartz

Slate

Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)

Dragon Blood Jasper

SiO2

Polished operculum (“Shiva eye” shell)

Calcium-carbonate shell operculum, commonly from a turban snail (family Turbinidae); not a mineral specimen

Serpentine-rich rock (possibly lizardite/serpentinite)

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

Likely galena-bearing ore or metallic sulfide rock

Possibly galena (PbS) with associated sulfide minerals; exact identification cannot be confirmed visually

Desert Rose (Baryte/Gypsum Rosette)

Baryte (BaSO4) or Gypsum (CaSO4·2H2O)

Gneiss (specifically a Banded Gneiss cobble)

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

Fine-grained dark metamorphic rock, likely slate or phyllite

Slate/phyllite, composed mainly of mica-group minerals, quartz, and clay-derived minerals

Schist

Mica Schist

Zircon

Zircon (Zirconium Silicate, ZrSiO4)

Granite

Granite (Felsic Plutonic Rock)

Agate

Chalcedony (cryptocrystalline variety of Quartz, SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Jasper and Agate Mix

Silicon dioxide (SiO2) - Microcrystalline Quartz

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Gneiss (specifically a Granitic Gneiss specimen)

Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Serpentinite

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

Granite Core Sample

Granite

Unakite (polished/tumbled)

Unakite, an epidote-altered granite composed chiefly of epidote, pink potassium feldspar, and quartz

Lapis Lazuli

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

Slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)

Greenstone / Serpentinite

Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)