Sedimentary Rock (Altered)

Greenstone (likely altered basalt or serpentinite)

Chlorite-rich metabasalt or serpentinite; exact identification requires testing

Polished/patinated jasper slab

Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide and clay inclusions

Unakite

Unakite (altered granite)

Epidote

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

Quartz-rich rock, possibly chrysoprase/chalcedony

Microcrystalline quartz (SiO₂), with iron-oxide staining and green inclusions; exact identification requires testing

Weathered basalt or iron-rich volcanic rock

Mafic volcanic rock, likely basalt; exact identification requires testing

Weathered volcanic rock, likely basalt

Basalt; commonly composed of plagioclase, pyroxene, and iron-rich oxides

Tumbled jasper, likely red/brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Porphyritic volcanic rock (likely andesite or basaltic andesite)

Porphyritic andesite/basaltic andesite; mainly plagioclase, pyroxene, and possibly olivine in a fine volcanic groundmass

Reddish weathered volcanic rock, probably andesite

Andesite (fine-grained plagioclase–pyroxene volcanic rock), possibly altered basalt

Unakite

Altered Granite (Epidotized Granite)

Tumbled yellow quartz-rich stone, likely yellow jasper or quartzite

Jasper/quartzite; mainly microcrystalline quartz (SiO₂), with iron-oxide staining

Tumbled gray-green pebble, likely chert or altered volcanic rock

Cryptocrystalline quartz (chert), possibly silicified volcanic material

Water-worn green pebble

Likely altered basalt or greenstone; precise identification requires testing

Epidote with Quartz/Feldspar

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock

Tumbled brown river stone

Likely weathered iron-rich basalt, greenstone, or other mafic metamorphic rock; exact identification requires testing

Turquoise

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

Quartz Vein in Greenstone

Hydrothermal Quartz (SiO2) with Chlorite/Epidote Schist host rock

Greenstone / altered mafic rock

Likely chlorite–actinolite schist or metabasalt; exact identification requires testing

Dolomite or Limestone (Carbonate Rock)

CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)

Tumbled ocean jasper or orbicular jasper

Microcrystalline quartz (SiO₂), commonly with chalcedony, feldspar, and iron-oxide inclusions

Lapis Lazuli (in Matrix)

Lazurite-bearing Metamorphic Rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Weathered basaltic rock

Basalt, likely amygdaloidal or altered basalt

Greenstone (Epidosite)

Epidosite (Metamorphosed Basalt/Diabase)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Epidote

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

Mookaite Jasper

Silicified Radiolarite (SiO2)

Weathered limestone or calcitic fossil/reef fragment

Calcite-rich limestone (CaCO₃), possibly fossiliferous limestone

Rounded weathered cobble, likely basaltic/volcanic rock

Fine-grained mafic volcanic rock, probably basalt (exact identification requires testing)

Unakite

Altered Granite (Unakite)

Amethyst Geode

Quartz (Silicon Dioxide, SiO2)

Vesicular volcanic rock, likely pumice or weathered scoria

Pumice/scoria; predominantly volcanic glass and plagioclase, with possible pyroxene or iron oxides

Quartz-veined weathered host rock

Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host

Likely tumbled lepidolite-bearing mica schist

Lepidolite-rich mica schist; chiefly lepidolite/muscovite mica, quartz, and possibly feldspar

Weathered iron-rich rock, possibly basalt or ironstone

Likely vesicular basalt or ferruginous breccia; exact identification requires testing

Serpentine (Nephrite-like River Cobble)

Serpentinite (Hydrous Magnesium Iron Silicate)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Unakite

Altered Granite (Epidotized Granite)

Iron-rich jasper or hematite-bearing chert

Microcrystalline quartz (SiO₂) with hematite/goethite (Fe₂O₃/FeO(OH))

Unakite

Unakite (Altered Granite)

Peridotite (Dunite/Lherzolite)

Ultramafic Peridotite

Unakite

Altered Granite (Granitic Metamorphic Rock)