Metamorphic Rock (Composed Of Multiple Minerals)

Granite

Felsic intrusive igneous rock

Polished tiger’s-eye (likely iron-rich quartzite)

Quartzite composed mainly of SiO₂, with fibrous crocidolite pseudomorphs oxidized to iron oxides

Dalmatian Jasper / Dalmatian Stone

Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)

Slate

Low-grade Metamorphic Rock (composed of quartz, illite, chlorite)

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Likely slate

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

Polished pegmatitic granite (likely graphic granite)

Coarse-grained granitic rock composed chiefly of quartz, feldspar, and biotite/hornblende

Fancy Jasper (Agate/Chert mix)

Silicon Dioxide (SiO2) with various inclusions

Quartzite Cobble

Metamorphosed Quartz Sandstone (primarily SiO2)

Likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite and pyroxene remnants

Quartzite pebble

Metamorphic Quartzite (SiO2)

Likely serpentinite (serpentine-rich rock)

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

Quartz-bearing feldspathic rock, likely weathered granite or pegmatite

Granite/pegmatite; chiefly quartz (SiO₂) and feldspar, with possible mica

Granite (Polished Countertop Surface)

Plutonic Igneous Rock (Felsic)

Quartzite Cobble

Quartzite (SiO2)

Quartzite (River Cobble)

Quartzite (SiO2)

Serpentinite

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

Serpentinite

Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)

Quartzite

Metamorphic Rock (composed mainly of SiO2)

Quartzite (River Cobble)

Metamorphic Rock (composed predominantly of SiO2)

Fossil crocodilian skull and jaws

Crocodyliform fossil; exact genus and species cannot be determined from the image

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Granite

Granite

Serpentinite

Serpentinite (composed mainly of serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 dominated)

Serpentinite

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

Dalmatian Stone and Lapis Lazuli

Dalmatian Stone (peralkaline rock) with Lapis Lazuli (metamorphic rock)

Red-and-black slate

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

Tumbled green aventurine (probable)

Quartzite composed chiefly of quartz (SiO₂), with green fuchsite or other mica inclusions

Mixed rounded river pebbles, probably quartz-rich metamorphic and volcanic rocks

Predominantly quartzite/metachert, with possible rhyolite, sandstone, and iron-stained quartz; exact species cannot be determined confidently from the image

Likely quartz-rich stone (possibly quartzite)

Quartzite, composed predominantly of quartz (SiO₂)

Likely slate fragment

Slate; fine-grained foliated metamorphic rock composed mainly of clay minerals, quartz, and mica

Dark speckled granite pebble

Granite, a quartz–feldspar–mica plutonic rock

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Bauxite

Bauxite (Al2O3·nH2O)

Gray slate

Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz

Unakite

Altered Granite (Granitic Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)

Polished green tumbled stone, likely serpentine

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

Serpentinite

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

Quartz-rich rock, likely granite or quartz-bearing metamorphic rock

Undetermined; possibly granitic rock composed mainly of quartz and feldspar, with mica or other dark minerals