Mineraloid (Human Made Geological Specimen)

Snowflake Obsidian

Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions

Polished dendritic agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites

White flint (chert)

Microcrystalline quartz, SiO₂

Flint or chert artifact

Microcrystalline quartz (SiO₂), likely worked flint/chert

Snowflake Obsidian (Flower Jasper variant)

Vitreous volcanic silicate with cristobalite inclusions

Obsidian (black volcanic glass)

Obsidian; predominantly silica-rich volcanic glass, commonly rhyolitic (approximately 70–75% SiO₂)

Tumbled rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Flint/Chert Nodule in Limestone

Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Chert with Limestone

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix

Tumbled pegmatitic granite

Coarse-grained granite/pegmatite, chiefly quartz, feldspar, and biotite or amphibole

Dark basalt or industrial slag (tentative)

Basalt; predominantly plagioclase and pyroxene, possibly with olivine

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Chert Arrowhead (Lithic Artifact)

Microcrystalline Quartz (SiO2)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Snowflake Obsidian

Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Chert (specifically Jasper or Flint variety)

Cryptocrystalline Quartz (SiO2)

Tumbled labradorite

Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Chert (specifically Zebra Chert/Flint)

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass

Obsidian

Volcanic Glass (predominantly SiO2)

Coquina and Oyster Fossil Rock

Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells

Snowflake obsidian

Volcanic glass (mostly rhyolitic) with cristobalite or feldspar spherulites

Polished hematite (speculative)

Hematite, α-Fe₂O₃; possibly hematite-rich ironstone

Polished labradorite cabochon

Labradorite, a calcic plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Obsidian

Volcanic Glass (Amorphous SiO2)

Black Obsidian

Volcanic Glass

Arrowhead (Flint/Chert)

Microcrystalline Quartz (SiO2)

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Laterite

Laterite (Fe2O3 and Al2O3-rich residual rock)

Chert / Flint (Artifact)

Microcrystalline quartz (SiO2)

Obsidian with Mahogany Phasing

Volcanic Glass (SiO2 + Fe2O3)

Blue Diamond

Carbon with Boron impurities (C)

Obsidian

Obsidian (volcanic glass; primarily SiO2)

Faceted colorless gemstone, likely quartz (rock crystal)

Quartz, SiO₂

Chert (and Flint)

Silicon Dioxide (SiO2)

Opalite

Synthetically produced glass (Silicon Dioxide with metallic inclusions)

Tumbled green stone, possibly serpentine

Likely serpentine-group rock (mainly serpentine minerals; identification uncertain from the image)

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Obsidian

Volcanic Glass (SiO2)

Gemstone Beads

Various mineral species