Mineral, Possibly Rock Fragment Containing A Mineral

Iron-stained rock fragment, possibly quartz-rich

Unidentified quartz-rich rock with iron-oxide staining (likely hematite/goethite)

Small gray rock fragment

Indeterminate fine-grained silicate rock; possibly granite, gneiss, or weathered concrete-like lithic fragment

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained or included in a mixed rock; exact identification is uncertain from the image

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Likely weathered limestone fragment

Calcite-rich limestone (CaCO₃), possibly calcareous sandstone

Rounded purple-gray pebble

Undetermined fine-grained volcanic rock; possibly andesite or basalt

Small weathered rock fragment, possibly quartz-rich

Unidentified lithic fragment; species cannot be determined from the image

Weathered polymictic rock fragment, likely granite-rich conglomerate

Indeterminate mixed lithology; apparent granitic clasts containing quartz, feldspar, and dark mafic minerals

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

Uncertain; likely Fe-oxide/hydroxide–stained mafic rock (hematite Fe₂O₃, goethite FeO(OH), and silicates)

Weathered granitic rock fragment

Granite, likely quartz–feldspar–mica aggregate

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Quartz with Mica and Feldspar

Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)

Conglomerate (polymictic, possibly metamorphosed)

Polymictic conglomerate; clasts cemented in a dark, likely quartz-rich matrix

Gabbro (likely with Pyrite/Sulfide mineralization)

Mafic Intrusive Igneous Rock

Conglomerate (possibly breccia)

Polymictic clastic conglomerate; rounded clasts in a dark, likely volcanic-lithic matrix

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Tumbled basalt with vesicles and mineral infill

Basalt, commonly composed of plagioclase, pyroxene, and iron-rich oxides; dark patches may include zeolite, quartz, or calcite

Quartz-rich rock fragment, possibly chert or weathered quartz

Microcrystalline quartz (SiO₂), tentative identification

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Yellow-green jasper or serpentine-rich rock

Likely microcrystalline quartz (SiO₂) with iron-bearing and/or serpentine minerals; exact identification requires testing

Quartz-rich rock fragment, possibly milky quartz with iron staining

Quartz (SiO₂), potentially vein quartz or quartz-bearing pegmatite

Small rough mineral/rock fragment

Indeterminate; possibly quartz-bearing rock or weathered feldspar

Quartz-rich breccia or vein quartz

Quartz (silicon dioxide, SiO₂), likely with iron-oxide staining and other pale gangue minerals

Reddish-brown, iron-stained rock fragment

Indeterminate; possibly weathered porphyritic volcanic rock

Reddish-brown rock fragment, possibly iron-stained sandstone

Unidentified iron-oxide-stained rock; sandstone is a tentative visual identification

Shale (possibly Carbonaceous or Oil Shale)

Laminated Mudstone (primarily clay minerals and quartz)

Turquoise

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Iron-rich rock fragment (possibly ironstone or limonite/goethite)

Likely ironstone composed largely of goethite/limonite; image alone cannot confirm

Unidentified dark green rock, possibly serpentinite

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), identification uncertain from the blurred image

Possibly garnet-bearing rock fragment

Unidentified reddish-brown mineral or rock; the image is insufficient for a reliable species identification.

Likely weathered quartz-bearing rock fragment

Provisional identification: quartz-rich sandstone or microcrystalline quartz (SiO₂)

Small weathered stone fragment

Undetermined; possibly a feldspar- or quartz-bearing rock fragment

Weathered greenish rock fragment

Tentatively altered basalt or serpentinite; exact identification requires testing

Likely garnet crystal fragment

Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)

Small pale mineral fragment

Indeterminate; possibly quartz or calcite

Milky quartz (likely quartz-rich metamorphic rock)

Quartz, silicon dioxide (SiO₂); possibly quartzite or quartz-veined rock

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly with calcite or feldspar

Small dark mineral or rock fragment

Undetermined; possibly a dark mafic mineral such as biotite or magnetite

Small polished stone, possibly a dark agate or jasper pebble

Undetermined; likely microcrystalline quartz (SiO₂)

Likely quartz-rich rock fragments

Uncertain; probable quartz with iron-oxide staining, possibly mica-bearing metamorphic rock

Likely rough mineral specimen (possibly mica-rich)

Indeterminate from the image; a mica such as muscovite or biotite is one possibility