Metamorphic Or Sedimentary Depending On Local Grade

Possible fossilized bone fragment

Indeterminate mineralized bone; taxon and age cannot be determined from the photo

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Water-worn green pebble

Likely altered basalt or greenstone; precise identification requires testing

Botryoidal prehnite

Prehnite, Ca₂Al(AlSi₃O₁₀)(OH)₂

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Gneiss

Banded orthogneiss or paragneiss, typically quartz–feldspar–mica bearing

Gray flagstone, likely slate

Slate, a fine-grained metamorphic rock composed mainly of quartz, mica, and chlorite

Likely polished gray quartzite or chert

Quartzite, predominantly microcrystalline SiO₂; possibly gray chert (chalcedony/quartz)

Likely blue-gray gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Sapphirine in Matrix

Sapphirine (Mg,Al)8(Al,Si)6O20

Likely slate fragment

Slate; fine-grained foliated metamorphic rock, commonly quartz–mica–chlorite rich

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Weathered metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably quartz–mica-rich phyllite (exact identification requires testing)

Unidentified gravel and stone fragments

Mixed, indeterminate lithologies; likely quartz, feldspar, and weathered silicate rock fragments

Biotite-rich gneiss or schist

Mica gneiss/schist; primarily quartz, feldspar, biotite, and possibly amphibole

Mica Schist with Garnet inclusions

Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)

Amethyst Beads

Quartz (Silicon Dioxide, SiO2 with iron impurities)

Polished banded gneiss pebble

Gneiss, commonly quartz–feldspar–biotite gneiss

Quartz (specifically a water-worn river pebble)

Silicon Dioxide (SiO2)

Quartz (Milky or Yellow/Citrine Quartz)

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Green Chalcedony Ring

Silicon Dioxide (SiO2)

Likely iron-stained quartz pebble

Quartz (SiO₂), possibly with iron-oxide staining

Weathered foliated metamorphic rock, likely schist or phyllite

Micaceous quartz–feldspar schist/phyllite; exact identification requires microscopy or testing

Foliated metamorphic rock, likely slate or phyllite

Fine-grained metapelite; commonly quartz–mica–chlorite with possible graphite

Schist

Mica Schist

Ruby in Quartz with Tourmaline

Corundum (Al2O3) in Silicon Dioxide (SiO2) with Schorl

Likely coal (possibly anthracite)

Coal, composed chiefly of carbon-rich organic matter; rank cannot be confirmed from the photograph

Black shale or slate fragment

Carbonaceous shale; possibly low-grade slate (clay minerals, quartz, carbon/graphite)

French Bulldog (Blue Variety)

Canis lupus familiaris

Gray slate

Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz

Possible garnet crystal

Likely almandine garnet, Fe₃Al₂(SiO₄)₃; identification is uncertain from this small image

Serpentinite (or Green Quartz Pebble)

Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)

Tsavorite Garnet

Grossular Garnet, Ca3Al2(SiO4)3

Red sandstone boulder

Quartz-rich sandstone, commonly arkose or iron-oxide-cemented sandstone

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Larimar

Pectolite (NaCa2Si3O8(OH))

Dark metamorphic pebble, likely slate or phyllite

Slate/phyllite; chiefly fine-grained mica and quartz, with possible chlorite and graphite

Feldspathic Granite (likely Syenite or Granite Pegmatite)

Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)

Jadeite Carving (Pixiu)

Jadeite (NaAlSi2O6)