Not A Rock Or Mineral (Anthropogenic Material)

Tumbled yellow jasper (probable)

Jasper, an opaque microcrystalline variety of quartz; chiefly SiO₂ with iron-oxide inclusions

White druzy quartz pendant with a blue crystal accent

Quartz (SiO₂); the blue material is not identifiable from the image

Sandstone

Quartz Arenite / Sedimentary Rock

Sandstone

Sedimentary Rock (Quartz Arenite)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Sandstone (Iron-stained)

Arenite with Limonite/Hematite staining

Tiny metallic-looking mineral or rock fragment

Unidentifiable from the image; possibly a small metallic mineral grain

Serpentine (rough serpentine-rich rock)

Serpentine-group minerals, chiefly antigorite and/or lizardite; composition broadly Mg₃Si₂O₅(OH)₄

Greenstone pebble (likely altered basalt or serpentine)

Greenschist-facies mafic rock; commonly chlorite–actinolite–epidote ± serpentine

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

Banded metamorphic rock, likely gneiss

Foliated quartz–feldspar rock (gneiss; exact identification requires closer examination)

Milky quartz with dark host-rock inclusions

Quartz (SiO₂), likely in a granitic or metamorphic matrix

Fossilized shell fragment

Likely calcitic or aragonitic bivalve/gastropod shell; exact taxon indeterminate

Epidote-rich rock (likely epidotite or altered basalt)

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); possibly epidote-bearing mafic rock

Sandstone

Sedimentary rock composed mainly of quartz sand

Sandstone (with potential fossil fragments)

Sandstone (SiO2 dominated with iron oxides)

Unidentified brown mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar, or weathered limonite

Quartz Vein in Sandstone

Quartz (SiO2) in Clastic Sedimentary Rock

Sandstone

Clastic Sedimentary Rock

Quartz-rich gravel fragment

Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions

Tumbled pink granite

Granite (quartz, feldspar, and mica; exact variety uncertain)

Biotite-bearing granite

Granite, composed chiefly of quartz, feldspar, and biotite; exact identification is uncertain from the photo.

Pegmatitic gneiss with a quartz–feldspar vein

Quartz–feldspar-rich gneiss, locally cut by a granitic pegmatite vein

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)

Sandstone

Arenite (primarily Quartz, SiO2)

Unidentified gray rock fragment

Indeterminate from image; possibly quartz- or feldspar-rich silicate material

Sandstone

Clastic Sedimentary Rock

Quartz vein in host rock

Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist

Banded gneiss

Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss

Sandstone

Arenite (Clastic Sedimentary Rock)

Obsidian Arrowhead

Volcanic Glass (Primary composition: SiO2)

Dalmatian jasper

Quartz-bearing alkali feldspar syenite/porphyritic igneous rock, commonly marketed as Dalmatian jasper

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Sandstone

Sedimentary Rock (Quartz arenite)

Grass (Organic Matter/Soil)

Poaceae (family of monocotyledonous flowering plants)

Fine-grained, banded rock (possibly gneiss)

Unidentified foliated silicate rock; composition cannot be determined from this close-up

Asphalt Concrete

Bituminous conglomerate

Turquoise jewelry beads/earrings

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly reconstructed or imitation turquoise

Sandstone (Pebble)

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 composed primarily of quartz)

Sandstone (Iron-stained)

Arenite (primarily SiO2 with Fe2O3 staining)