Sedimentary Rock (Altered)

Epidote

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))

Jasper

Microcrystalline Quartz (SiO2)

Greenstone pebble (possibly altered basalt)

Chlorite- and/or epidote-altered basalt; exact identification requires testing

Brecciated Jasper

Silicon Dioxide (SiO2) with iron impurities

Weathered iron-rich sandstone or ironstone

Ferruginous sandstone, composed mainly of quartz (SiO₂) cemented by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Weathered sandstone or arkose fragment

Quartz-rich clastic sedimentary rock; likely sandstone/arkose (dominantly SiO₂ quartz with feldspar and lithic grains)

Likely altered volcanic rock (greenstone)

Chlorite–epidote–actinolite-rich metavolcanic rock; exact identification requires testing

Yellow Quartz (Citrine / Milky Quartz)

Silicon Dioxide (SiO2)

Banded quartz-rich metamorphic rock (likely quartzite or quartz-mica schist)

Quartzite/schist composed chiefly of SiO₂ quartz with mica, feldspar, and iron-oxide or copper-colored accessory minerals

Weathered basalt or volcanic breccia

Fine-grained mafic volcanic rock, likely basalt (plagioclase–pyroxene ± olivine), possibly brecciated

Likely mica-rich metamorphic rock (schist)

Mica schist, probably biotite–muscovite schist; exact identification requires closer examination

Turquoise

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

Orange calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Tumbled Chalcedony

Quartz (Silicon Dioxide - SiO2)

Weathered sandstone or iron-stained limestone

Likely quartz-rich sandstone (SiO₂) or ferruginous limestone (CaCO₃); exact identification requires testing

Possible weathered sandstone or iron-rich sedimentary rock

Indeterminate; likely quartz-rich sandstone with iron-oxide cement

Greenstone (likely actinolite-bearing metamorphic rock)

Actinolite-rich greenschist; exact identification requires testing

Greenstone (likely serpentine-rich rock)

Serpentinite, composed mainly of serpentine-group minerals

Unakite

Epidotized Granite

Quartz-rich conglomeratic rock (likely granitic breccia or conglomerate)

Uncertain; quartz–feldspar rock in a fine-grained matrix, possibly weathered granite or polymictic conglomerate

Likely greenstone (chlorite/epidote-altered basalt), waterworn pebble

Greenschist-facies metabasalt; commonly composed of chlorite, actinolite, epidote, and albite

Weathered mica-rich rock (tentative identification)

Possibly mica schist or phyllite; exact identification requires closer examination

Rounded gray river pebble

Likely fine-grained quartz-rich sandstone or siltstone; exact identification requires a fresh surface and tests

Small weathered rock fragment

Indeterminate; possibly limestone or altered volcanic rock

Fine-grained metamorphic rock, likely slate or phyllite

Slate/phyllite; composition commonly quartz, mica, and chlorite

Likely tumbled greenstone (identity uncertain)

Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote

Small dark rock fragment, possibly shale or slate

Undetermined fine-grained silicate rock; visual identification is inconclusive

Rounded greenish pebble

Indeterminate; likely weathered quartzite, greenstone, or altered volcanic rock

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored chiefly by iron oxides

Likely greenstone (altered basalt)

Chlorite–actinolite-bearing metabasalt; identification is tentative from the image

Dark, mica-rich metamorphic rock (possibly schist)

Mica schist, tentatively; exact identification is limited by the small, partly obscured specimen

Fossil bivalve shell

Fossilized or partially mineralized bivalve; exact genus cannot be determined from the image

Weathered iron-rich rock, possibly basalt or limonite-bearing sandstone

Undetermined; likely Fe-oxide-stained basalt or ferruginous sandstone (hematite/goethite-bearing)

Weathered greenstone pebble

Likely metabasalt (chlorite–actinolite-rich greenschist); exact identification requires close examination

Fossil brachiopod shell

Brachiopoda; likely a ribbed Paleozoic brachiopod, exact genus uncertain from the image

Tumbled jasper or iron-rich chert

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

Polished red jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Banded Sandstone / Quartzite with Mineral Veins

Sedimentary rock (Quartz arenite with iron oxide/silica banding)

Unakite

Altered Granite

Likely weathered iron-rich breccia or jasper

Silicified iron-oxide breccia; exact identification requires testing

Weathered iron-stained stone, likely graywacke or altered sandstone

Indeterminate lithic fragment; probable quartz-rich sandstone/graywacke with iron-oxide staining

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and pale silica-rich fragments