Mineralological Specimen

Mica (Biotite and Muscovite) in Matrix

Potassium aluminum silicate with iron/magnesium (KAl2(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(F,OH)2)

Clear Quartz

Silicon dioxide (SiO2)

Orange Calcite (Iron-Stained)

Calcium Carbonate (CaCO3)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Cryptocrystalline Quartz (SiO2)

Granite Cobble

Granite (Phaneritic Quartz-Feldspar specimen)

Portable Ceramic Space Heater

Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements

Iron-stained quartz crystal aggregate

Quartz (SiO₂), likely included or coated with limonite/goethite

Fossiliferous limestone, possibly coral limestone

Calcite-rich carbonate rock; chiefly calcium carbonate (CaCO₃), with probable fossil coral or shell structures

Tumbled citrine (likely heat-treated amethyst or quartz)

Quartz, SiO₂; yellow coloration from iron impurities or irradiation/heat treatment

Blue-green rough mineral specimen (identity uncertain)

Undetermined; the image is insufficient for a reliable mineral identification

Likely quartz-rich stone (possibly quartzite)

Quartzite, composed predominantly of quartz (SiO₂)

Iron-stained quartz vein in a fine-grained host rock

Quartz (SiO₂) filling a fracture in an unidentified silicate rock; orange coloration likely from iron oxides/hydroxides

Quartz-rich rock, possibly milky quartz with iron staining

Predominantly quartz (SiO₂); exact rock type cannot be confirmed visually

Likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Iron-oxide-stained sandstone

Quartz-rich sandstone, likely cemented by iron oxides (hematite/goethite)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Tumbled milky quartz

Quartz (SiO₂), likely milky quartz

Chert (Chert breccia)

SiO2 (Silicon Dioxide)

Quartz pebble with host matrix

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Basalt (River Stone)

Basalt (SiO2 range 45-52%)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Chert (specifically Jasper/Carnelian variety)

Microcrystalline quartz (SiO2)

Amethyst

Silicon dioxide (SiO2) with iron impurities

Banded Calcite (Honey Calcite)

Calcium Carbonate (CaCO3)

Iron-stained Quartz

Silicon Dioxide with Limonite (SiO2 + FeO(OH)·nH2O)

Quartz-veined dark metamorphic rock, likely marble or serpentinite

Calcite- or magnesite-veined serpentinite/marble; exact identification requires testing

Iron-stained quartzite

Quartzite, composed predominantly of recrystallized quartz (SiO₂), with iron-oxide staining

Chalcedony (Jasper/Agate mix)

Quartz (microcrystalline SiO2)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Vesicular Basalt (Iron Scoria)

Aphanitic Mafic Igneous Rock with Vesicular Texture

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Small yellow-brown stone, possibly iron-stained quartz or chert

Undetermined; visual evidence is insufficient for a confident identification

Quartz-rich rock (likely iron-stained vein quartz)

Predominantly quartz (SiO₂), with possible iron-oxide staining and minor host-rock minerals

Iron-stained quartz with possible mica

Quartz (SiO₂), with iron-oxide staining and possible mica or feldspar inclusions

Milky quartz

Quartz (SiO₂), likely iron-stained or feldspar-bearing

Shark Tooth Fossil

Carcharodonta (order Lamniformes), likely Carcharias spp.

Pink tourmaline crystal (likely polished or rough-cut)

Elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃

Weathered iron-rich mineral concretion

Likely limonite/goethite concretion (hydrated iron oxides), possibly a weathered ironstone fragment

White marble tile

Calcite-rich marble (CaCO₃)

Coarse-grained granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly metamorphosed to gneiss