Sedimentary Rock (Altered)

Iron-stained quartz-rich rock, possibly weathered sandstone

Quartz-rich sandstone with limonite/goethite staining; exact identification requires testing

Gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and tests

Possibly banded ironstone (iron-rich metamorphic rock)

Likely ferruginous quartzite or iron formation; exact identification requires testing

Peridotite

Ultramafic intrusive igneous rock

Weathered iron-rich sandstone or ironstone cobble

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

Pyrite-bearing rock (likely pyrite-rich schist or quartzite)

Pyrite, FeS₂, disseminated in a metamorphic host rock

Weathered sandstone or quartz-rich sedimentary rock

Likely quartz arenite or feldspathic sandstone; exact identification requires testing

Chert Nodule in Limestone

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

Peridotite

Ultramafic igneous rock

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Tumbled sandstone or quartz-rich sedimentary pebble

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

Weathered sandstone or iron-stained sedimentary rock

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

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Oolitic Chert

Ooidal Microcrystalline Quartz (SiO2)

Weathered foliated metamorphic rock, likely mica schist

Mica schist (likely quartz–muscovite/biotite schist; exact identification requires closer inspection)

Banded gneiss (likely biotite-bearing)

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

Dalmatian Jasper

Microcrystalline Quartz with Arfvedsonite and Tourmaline

Unakite

Altered Granite

Sandstone (with weathering rind)

Arenite (primarily SiO2 with iron oxide cementing)

Red jasper or hematite-rich rock

Red jasper (microcrystalline quartz, SiO₂) with hematite (Fe₂O₃)

Likely weathered sandstone fragment

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

Foliated metamorphic rock, likely gneiss with amphibolite or chlorite-rich bands

Biotite–quartz–feldspar gneiss, locally mafic amphibolite; mineral composition is uncertain from the photograph

Granitic Gneiss

Gneiss (High-grade metamorphic rock)

Unakite

Unakite (altered granitic rock)

Greenstone (likely chlorite- or epidote-rich metamorphic rock)

Greenstone; commonly metamorphosed basalt or dolerite, with chlorite, epidote, and actinolite

Likely chlorite schist

Chlorite-rich schist; commonly composed of chlorite, quartz, and mica

Small weathered rock fragment

Indeterminate; possibly granitic or altered feldspathic material

Weathered graywacke or sandstone fragment

Lithic sandstone, likely quartz–feldspar–rock-fragment aggregate

Chakra Stone Bracelet

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

Jasper

Microcrystalline Quartz (SiO2)

Jasper and Epidote in Quartzite

Metamorphic rock containing microcrystalline quartz, epidote, and jasper

Likely mica schist

Mica-rich schist, likely quartz–muscovite/biotite schist

Likely greenstone (chlorite-rich metamorphic rock)

Greenstone, commonly altered basalt containing chlorite, epidote, and actinolite

Tumbled carnelian

Carnelian, an orange variety of chalcedony (microcrystalline quartz, SiO₂)

Yellow-brown sandstone

Quartz-rich clastic sandstone, likely ferruginous sandstone

Weathered iron-rich rock (likely ironstone or altered basalt)

Probable limonite/goethite-bearing basalt or ironstone; exact identification requires testing

Likely limestone or marble fragment

Calcite-rich carbonate rock; CaCO₃

Unakite

Altered Granite

Weathered limestone

Limestone, predominantly calcite (CaCO₃)

Polished orange-brown jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Greenstone (likely chlorite-rich metamorphic rock)

Greenstone; commonly altered mafic rock composed of chlorite, actinolite, epidote, and albite

Orange Calcite

Calcium Carbonate (CaCO3)