Sedimentary Rock (Altered)

Tumbled greenstone / serpentinite (probable)

Serpentinite, chiefly Mg-rich serpentine minerals (antigorite, lizardite, chrysotile), possibly mixed with chlorite, magnetite, or carbonate

Weathered iron-rich volcanic rock

Likely altered basalt or andesite with iron-oxide staining

Tumbled pink feldspar-rich granite (likely potassium feldspar)

Granite/pegmatitic feldspar aggregate; chiefly KAlSi₃O₈ with quartz and minor mica or iron oxides

Weathered feldspathic sandstone

Quartz–feldspar arenite, likely iron-oxide stained

Chert or flint nodule/fragment

Microcrystalline quartz (SiO₂), commonly with chalcedony

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).

Chrysocolla and Azurite in Matrix

Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)

Weathered quartz-rich metamorphic rock (probable quartzite)

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica, feldspar, and iron-oxide impurities

Waterworn greenstone pebble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

Weathered basalt or mafic volcanic rock

Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Iron-rich sandstone or weathered laterite

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Heat-Treated Amethyst (Citrine Geode)

Silicon Dioxide (SiO2) with iron impurities

Serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with magnetite and minor chromite/talc

Tumbled carnelian

Carnelian, orange-red variety of cryptocrystalline chalcedony (SiO₂)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartz-bearing rock, possibly weathered granite or pegmatite

Quartz–feldspar–mica aggregate; exact classification is uncertain from the image

Jasper

Silicon Dioxide (SiO2)

Flint (chert) flake/tool

Microcrystalline quartz (SiO₂), likely brown flint/chert

Tumbled carnelian

Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Unakite

Unakite (epidote-bearing altered granite; mainly pink potassium feldspar, green epidote, and quartz)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)

Shale

Shale (clastic sedimentary rock)

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli

Sodalite-rich metamorphic rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly antigorite/lizardite/chrysotile, commonly after peridotite (olivine–pyroxene)

Weathered granitic pebble

Likely biotite-bearing granite or granodiorite, dominated by quartz and feldspar

Weathered granitic or gneissic cobble

Likely altered granite/granodiorite; exact identification requires a fresh surface and testing

Rounded greenstone pebble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

Weathered mafic rock, likely basalt or greenstone

Fine-grained basaltic rock; possibly altered basalt (metabasalt/greenstone)

Lapis Lazuli

Lapis Lazuli (Complex rock consisting primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2)

Tumbled pegmatitic granite

Granite, chiefly quartz–feldspar–mica; likely altered pegmatite

Weathered rhyolite or felsic volcanic rock

Rhyolite, commonly quartz–alkali feldspar–plagioclase with iron-oxide alteration

Chrysoprase

Chalcedony (cryptocrystalline SiO2 variety)

Orbicular basalt (amygdaloidal basalt)

Basalt, commonly with iron-oxide–stained amygdules; matrix chiefly plagioclase, pyroxene, and often olivine

Quartz-rich pegmatite or quartz vein rock

Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining

Tumbled carnelian (likely)

Chalcedony, microcrystalline quartz (SiO₂), iron-oxide colored variety

Unakite

Unakite (altered granitic rock: SiO2 + Ca2(Al,Fe)3(SiO4)3(OH))

Turquoise cabochon

Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)

Leopard jasper (orbicular jasper)

Silicified volcanic tuff/chert; predominantly microcrystalline quartz (SiO₂) with iron oxides and volcanic minerals

Rounded iron-rich sandstone or weathered ironstone pebble

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides

Shale

Laminated Mudstone (Shale)