Mineral Based Composite

Quartz Fragment

Silicon Dioxide (SiO2)

Granite Pebble

Granite (Plutonic Igneous Rock)

Vesicular Basalt

Basalt (Mafic volcanic rock)

Fossilized Shark Tooth

Chondrichthyes (Class)

Siltstone Pebble

Siltstone (composed of microscopic quartz and clay minerals)

Prehnite with Epidote

Prehnite (Ca2Al(AlSi3O10)(OH)2) with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Sandstone with Quartz Sphere

Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere

Map Jasper (Picasso Stone)

Metamorphosed Calcium Carbonate (Crystalline Limestone or Marble with Silicate inclusions/impurities)

Dalmatian Stone

Dalmatian Jasper / Feldspathic Igneous Rock

Diamond

Diamond (C)

Mica-rich schist (likely biotite schist)

Mica schist, composed mainly of biotite and/or muscovite with quartz and feldspar

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Quartz (Druzy)

Silicon Dioxide (SiO2)

Angel Aura Quartz

Silicon dioxide treated with precious metals (SiO2)

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Quartzite with Calcite Accretion

Metamorphosed Quartz Sandstone (SiO2 with CaCO3 coating)

Topaz

Al_2SiO_4(F,OH)_2

Basalt with Vesicular Amygdule

Extrusive igneous rock (Mafic)

White Topaz

Topaz [Al2SiO4(F,OH)2]

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Rutilated Quartz (or possibly Tourmalinated Quartz, White Rutile)

SiO2 with TiO2 inclusions

Polished chrysocolla cabochon

Chrysocolla, a hydrated copper silicate (approx. Cu₂H₂Si₂O₅(OH)₄·nH₂O); possibly stabilized or composite material

Gravel and Sand Aggregate

Unconsolidated Clastic Sediment

Quartz with Mica

SiO2 (Quartz) with Potassium aluminum silicate (Muscovite)

Gravel and Sand Mixture

Unconsolidated clastic sediment

Topaz

Al2SiO4(F,OH)2

Leopard Skin Jasper

Rhyolite (Silicon Dioxide with impurities), SiO2

Likely muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Likely rose quartz in a dark matrix

Quartz, SiO₂; the host rock cannot be identified from this photo

Likely dyed or painted stone

Unidentified natural rock; vivid purple, orange, and pink coloration appears to be a surface coating or pigment, so the underlying rock cannot be reliably identified from the image.

Diamond

Carbon (C)

Possible pink quartz specimen in a dark matrix

Uncertain from the image; possibly rose quartz (SiO₂) attached to a dark host rock

Dragon Vein Agate

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Al,Si,V)4O10(F,OH)2

Dalmatian jasper (Dalmatian stone)

Commercially called Dalmatian jasper; typically a feldspar-rich rock with dark arfvedsonite or tourmaline-group inclusions, rather than true jasper

Quartzite Cobble / Quartz River Pebble

Silicon Dioxide (SiO2) - Quartzite / Quartz

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2

Topaz

Al2SiO4(F,OH)2

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Limonite/Goethite on Shale

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

Granite

Granite (Felsic Plutonic Rock)

Porphyritic Basalt

Porphyritic Basalt (Silicate Rock)