Sedimentary Rock (Altered)

Epidote-bearing Rock

Epidote / Silicate mineral aggregate

Tumbled sandstone or quartz-rich sedimentary pebble

Likely quartz–feldspar sandstone (SiO₂-rich clastic rock); exact identification requires testing

Unakite

Altered Granite

Granitic Gneiss

Gneiss (High-grade metamorphic rock)

Unakite / Epidotized Granite

Metamorphic Granite (Epidote-Orthoclase-Quartz Rock)

Chakra Stone Bracelet

Mixed Mineral Assembly (Scoria, Amethyst, Lapis Lazuli, Turquoise/Howlite, Impression Jasper, Tiger's Eye, Carnelian, Red Jasper)

Weathered iron-rich sandstone or ironstone cobble

Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) cemented or stained by iron oxides and hydroxides

Peridotite

Ultramafic igneous rock (primarily olivine and pyroxene)

Greenstone or Epidote-rich rock

Epidote or Chlorite schist/greenstone

Likely weathered sandstone fragment

Quartz-rich sandstone, predominantly SiO₂ with minor feldspar and iron-oxide cement

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Banded gneiss (likely biotite-bearing)

Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining

Jasper and Epidote in Quartzite

Metamorphic rock containing microcrystalline quartz, epidote, and jasper

Banded limestone or marble

Calcite-dominated carbonate rock; likely banded marble (CaCO₃)

Vesicular basalt with secondary zeolite/mineral crusts

Basalt, chiefly plagioclase–pyroxene ± olivine; cavities partly filled by zeolites or calcite

Jasper

Microcrystalline Quartz (SiO2)

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone; exact identification is uncertain from the photograph

Turquoise

Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)

Brecciated quartz-rich rock, possibly silicified breccia

Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining

Tumbled yellow jasper (likely serpentine or calcite-rich stone)

Jasper: microcrystalline quartz (SiO₂); exact yellow veining may indicate serpentine, calcite, or iron oxides

Orange Calcite

Calcium Carbonate (CaCO3)

Weathered reddish-brown rock fragment

Probably altered basalt or fine-grained volcanic rock; exact identification requires testing

Chert Nodule in Limestone

Sedimentary rock comprising microcrystalline quartz (chert) and calcium carbonate (limestone)

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; composition commonly quartz, mica, and chlorite

Dark gray volcanic rock, probably andesite or basalt

Fine-grained mafic–intermediate volcanic rock; likely basalt (plagioclase ± pyroxene), possibly andesite

Granite (likely weathered, pegmatitic granite)

Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Greenstone (Epidosite or Serpentinite)

Metabasalt / Epidote-Chlorite Schist

Unakite

Unakite (altered granitic rock)

Unakite

Epidotized Granite

Likely vesicular basalt with weathering minerals

Basalt, primarily plagioclase and pyroxene, with possible iron oxides and secondary zeolite/carbonate minerals

Weathered volcanic rock, likely andesite or basaltic-andesite

Fine-grained plagioclase–pyroxene volcanic rock; possible altered andesite (exact identification requires testing)

Wonderstone Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

River Cobble (Weathered Granitoid)

Granodiorite / Quartz Diorite

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Mixed river-worn rock and mineral collection

Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble

Turquoise

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

Green Greenstone / Celadonite-bearing Metamorphic Rock

Greenschist / Celadonite / Serpentinitic pebble

Banded calcite (likely marble or calcite-rich limestone)

Calcite, CaCO₃; possibly calcitic marble

Small shell fragment (likely gastropod or bivalve fossil)

Fossilized calcium-carbonate shell; chiefly aragonite or calcite (CaCO₃)

Epidote or Unakite Rock

Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)

Weathered sandstone (probable)

Quartz-rich sandstone, largely composed of cemented quartz grains (SiO₂)

Turquoise

Hydrated phosphate of copper and aluminum; CuAl6(PO4)4(OH)8·4H2O