Synthetic Material (Not A Rock Or Mineral)

Smoky Quartz

Silicon dioxide with aluminum impurities (SiO2)

Azurite-Malachite (often a mixed specimen)

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.

Sandstone

Arenite (SiO2 principal composition)

Ruby

Corundum (Al2O3)

Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)

Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image

Sandstone

Arenite

Sandstone

Arenite (SiO2 based)

Quartz-veined Limestone

Sedimentary limestone with quartz/calcite veinlets

Polished amber agate pendant/beads

Chalcedony (microcrystalline quartz), SiO₂, likely iron-stained yellow-orange agate

Greenstone pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

Sandstone

Clastic Sedimentary Rock

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Blue Sapphire

Corundum (Al2O3)

Sandstone (likely Greywacke or Lithic Sandstone)

Arenite / Wacke

Sandstone

Arenite

Gravel and Sediment Sample

Mixed clastic sediment

Sandstone (Banded)

Clastic Sedimentary Rock: Arenite

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Synthetic Blue Aura Quartz

Silicon Dioxide (SiO2) with Metallic Infusion

Weathered granite or granitic gneiss fragment

Granite; predominantly quartz, feldspar, and mica (exact identification requires testing)

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartz vein in dark host rock

Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock

Sandstone

Clastic Sedimentary Rock

Hematite

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Serpentinite

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

Quartz Pebble

Silicon Dioxide (SiO2)

Likely weathered iron-rich breccia or jasper

Silicified iron-oxide breccia; exact identification requires testing

Speckled feldspar-rich pebble

Likely leucocratic granite or granitic pegmatite, chiefly potassium feldspar with dark biotite or amphibole

Foliated metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica gneiss/schist; exact identification requires petrographic examination

Staurolite (Cross Stone)

Staurolite (Fe2+2Al9Si4O23(OH))

Strawberry Quartz (or Rose Quartz / Cherry Quartz)

Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions

Dyed Blue Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone

Clastic Sedimentary Rock

Sandstone

Sedimentary Rock (Quartz Sandstone)

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Opalite

Synthetic Glass, SiO2 base with metallic inclusions

Granite

Granite

Bismuth

Bismuth (Bi)

Sandstone

Arenite (primarily SiO2)

Quartz (Milky/Crystalline)

Silicon Dioxide (SiO2)