Metamorphic (Man Made)

Quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Likely black tourmaline (schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Clear quartz crystal (likely milky/included quartz)

Quartz, silicon dioxide (SiO₂)

Quartz-veined dark metamorphic rock, likely schist or gneiss

Quartz-bearing mica schist/gneiss; mainly quartz (SiO₂), feldspar, mica, and iron-oxide staining

Marble

Recrystallized Calcite (CaCO3)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Clear quartz crystal (tentative)

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite (iron pyrite)

Pyrite, FeS₂; cubic iron sulfide

Small brown mineral fragment, possibly garnet

Unidentified; garnet is a tentative visual possibility (garnet-group silicates, X₃Y₂(SiO₄)₃)

Mica schist (possibly garnet–mica schist)

Muscovite–biotite schist; chiefly quartz, feldspar, muscovite, and biotite

Garnet

Garnet group species (likely Almandine, Fe3Al2(SiO4)3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Iron-stained quartz pebble

Quartz (SiO₂), likely microcrystalline or massive quartz with goethite/limonite staining

Green apatite crystal

Apatite group; likely fluorapatite, Ca₅(PO₄)₃F

Quartz-rich pebble (likely milky quartz)

Quartz, SiO₂

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

White Marble

Recrystallized Calcite (CaCO3)

Likely quartz-rich rock (possibly milky quartz or quartzite)

Quartz-rich aggregate, predominantly silicon dioxide (SiO₂); exact identification is uncertain from the image

Milky quartz

Quartz (SiO₂), likely massive milky quartz

Polished banded green stone, likely serpentine or altered volcanic rock

Probable serpentine-rich serpentinite; exact identification requires testing

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

Likely milky quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Iron-rich quartzite or weathered ironstone

Quartzite dominated by quartz (SiO₂), with iron oxides such as hematite/goethite

Tumbled dark green stone, likely serpentine or nephrite jade

Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite, an aggregate of tremolite–actinolite

Slate or thinly bedded shale

Slate; primarily fine-grained mica/clay minerals and quartz

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Clear quartz crystal

Quartz, silicon dioxide (SiO₂)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz-veined metamorphic rock, likely schist or phyllite

Quartz-bearing mica schist/phyllite; exact identification requires closer examination

Greenstone / Greenstone Pebble

Greenschist (metamorphosed basalt or gabbro)

Quartz (massive milky quartz)

Quartz, silicon dioxide (SiO₂)

Weathered quartz-rich cobble, likely quartzite

Quartzite (mostly microcrystalline SiO₂), possibly quartz-rich sandstone or vein quartz

Quartz

Quartz (SiO2 - Silicon Dioxide)

Clear Quartz

Silicon Dioxide (SiO2)

Dark slate or fine-grained metamorphic rock

Slate; chiefly fine-grained phyllosilicates, quartz, and feldspar