Man Made Glass

Dyed turquoise-colored lava stone beads

Vesicular basalt (scoria), commonly sold as dyed lava rock

Turquoise cabochon ring

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Muscovite Schist

KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix

Red Sandstone

Arenite (Ferruginous Sandstone)

Jasper

Silicon dioxide (SiO2) with impurities

Fossil crinoid columnal in limestone

Crinoidea indet.; calcitic ossicle (CaCO₃)

Diabase (Greenstone)

Diabase (Dolerite)

Mixed stone-bead bracelet, likely agate/jasper and possibly sodalite or dyed quartz

Primarily microcrystalline quartz (SiO₂) varieties, with opaque iron-rich chalcedony/jasper and probable blue sodalite or dyed material

Green cabochon gemstone, likely glass-filled or synthetic emerald imitation

Uncertain; possible synthetic emerald (beryl, Be₃Al₂Si₆O₁₈) or green glass

Pink calcite (likely)

Calcite — calcium carbonate, CaCO₃

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Cut colorless gemstone, likely diamond

Diamond (crystalline carbon, C)

Quartz geode/druse, likely chalcedony matrix

Quartz, silicon dioxide (SiO₂), with possible microcrystalline chalcedony

Pumice or vesicular volcanic rock

Pumice; predominantly volcanic glass (silica-rich, commonly rhyolitic to dacitic)

Jade bangle

Likely nephrite jade (actinolite–tremolite amphibole); possibly jadeite

Quartz (Druzy / Goldstone Gemstone Cabochon)

Silicon Dioxide (SiO2)

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂); probable rose quartz

Limestone

Calcareous sedimentary rock (CaCO3)

Blue glass-like gemstone specimen (likely dyed or synthetic quartz)

Uncertain; possibly blue-dyed quartz or synthetic glass, not confidently identifiable from the image

Red Sandstone

Arenite (with Iron Oxide / Hematite staining)

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Pumice

Highly vesicular volcanic rock, typically rhyolitic to andesitic in composition

Fossilized sea urchin

Echinoid test, likely a regular sea urchin; calcite (CaCO₃)

Fossilized echinoid (sea urchin), likely a sand dollar fragment or small regular urchin

Echinodermata; commonly Clypeasteroida or Echinoida, preserved mainly as calcite (CaCO₃)

Black onyx or black obsidian bead bracelet

Likely black chalcedony (microcrystalline quartz, SiO₂); possibly volcanic glass (obsidian, SiO₂)

Tumbled blue quartz (likely blue aventurine)

Quartz, silicon dioxide (SiO₂), colored by microscopic inclusions—possibly dumortierite or amphibole

Weathered pegmatite or feldspar-rich granite fragment

Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Dyed Blue Agate Slice

Silicon Dioxide (SiO2)

Granite

Granite (felsic intrusive igneous rock)

Clear quartz pebble or glass-like quartz specimen

Quartz (silicon dioxide, SiO₂)

Scoria

Scoriaceous Basalt

Likely quartz fragment

Quartz (silicon dioxide, SiO₂)

Dark gray rounded stone, possibly basalt or slag

Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Quartz geode

Microcrystalline and druzy quartz (SiO₂), likely chalcedony-lined

Banded Calcite or Travertine

Calcium Carbonate (CaCO3)

Stilbite zeolite specimen

Stilbite, commonly Ca- or Na-rich zeolite: (Ca,Na)₂–₃Al₃(Al,Si)₂Si₁₃O₃₆·12H₂O

Limestone

Calcium Carbonate (CaCO3)

Blue-gray flint or chert fragment

Microcrystalline quartz (SiO₂), likely flint/chert

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Tumbled black stone, likely black obsidian

Obsidian — natural volcanic glass, predominantly silica-rich rhyolitic composition