Yellow chalcedony (likely lemon agate or yellow jasper)
Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony
mineral
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
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Demitasse Granite (Diorite-Granite transition)
Intermediate Plutonic Rock (Granodiorite/Diorite mix)
igneous
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Feldspar in Matrix
Feldspar group minerals in metamorphic or igneous matrix
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Quartz with Iron Oxide
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Serpentine
Antigorite/Chrysotile/Lizardite mix - Mg3Si2O5(OH)4
metamorphic
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Mineral
Quartzite
Metamorphic Quartzite
metamorphic
Amazonite
Amazonite (KAlSi3O8, a triclinic variety of Potassium Feldspar)
mineral
Feldspar
Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)
mineral
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO3)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Quartz (Rose/Pink variety)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Green iridescent glass cabochon or synthetic gemstone
Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone
gemstone
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Likely raw garnet crystal
Garnet-group silicate, probably almandine (Fe₃Al₂Si₃O₁₂)
mineral
Quartz with Mica (Granitic / Pegmatitic Quartz)
Silicon Dioxide (SiO2) with Mica group minerals
mineral
Serpentine
Serpentine group (e.g., Antigorite, Chrysotile, Lizardite) - (Mg,Fe)3Si2O5(OH)4
metamorphic
Sphalerite with Galena and Calcite / Quartz display specimens
Zinc Iron Sulfide (Zn,Fe)S with Quartz (SiO2) / Aquamarine / Fluorite
mineral
Quartz
Silicon dioxide (SiO₂)
Mineral
Tumbled white chalcedony (likely milky quartz)
Chalcedony, cryptocrystalline SiO₂; possibly common quartz or white agate
mineral
Red garnet crystal (possible almandine)
Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic