Metamorphic Rock (Composed Of Multiple Minerals)

Vesicular Basalt

Basalt (Mafic volcanic rock)

Serpentinite

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

Granite

Felsic intrusive igneous rock

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Marble (White)

Metamorphosed Limestone (mainly CaCO3)

Bauxite

Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Weathered quartz-rich rock, likely quartzite or quartz vein fragment

Quartzite, composed predominantly of SiO₂; possible iron-oxide staining

Serpentinite

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

Slate

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

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Polished pegmatitic granite (likely graphic granite)

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

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)

Dalmatian Stone

Dalmatian Stone (formerly called Dalmatian Jasper)

Dalmatian Jasper

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Unidentified dark, flat specimen

Indeterminate; image resolution is insufficient for mineral identification

Bumblebee Jasper

Carbonate-rich volcanic rock containing Sulfur and Arsenic (Realgar/Orpiment)

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Kambaba Jasper (Crocodile Jasper)

Stromatolitic Rhyolite/Jasper (SiO2)

Dyed Dalmatian Stone

Aplite (Alkali-feldspar granite) with Arfvedsonite

Rainbow Moonstone

White Labradorite (formula: (Na,Ca)(Al,Si)4O8)

Dalmatian Stone

Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)

Serpentinite

Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)

Seashell Fragment

Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Unakite

Altered Granite (Granitic Metamorphic Rock)

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Granite

Felsic intrusive igneous rock

Fancy Jasper (Agate/Chert mix)

Silicon Dioxide (SiO2) with various inclusions

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica/Amphibole)

Quartz-bearing feldspathic rock, likely weathered granite or pegmatite

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

Ferruginous Sandstone

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Red jasper

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

Bauxite

Bauxite (Al2O3·2H2O)

Dark green metamorphic rock, likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and minor chlorite/talc

Quartzite Cobble

Metamorphosed Quartz Sandstone (primarily SiO2)