Unknown (Likely Sedimentary Or Metamorphic)

Likely calcite-rich limestone or marble

Calcite (CaCO₃); possibly recrystallized limestone (marble)

Mixed Rock and Mineral Collection

Mixed Assemblage (includes Quartz, Jasper, Feldspar, and Turquoise-colored stones)

Likely quartz-rich stone or shell fragment

Uncertain; possibly quartz (SiO₂) or a calcareous shell fragment (CaCO₃)

Slate

Slate; fine-grained metamorphosed shale, commonly quartz–illite/chlorite rich

Polished banded gneiss, possibly garnet-bearing

Gneiss; composition likely quartz–feldspar–mica, with accessory amphibole or garnet

Tumbled yellow quartz-rich stone, likely yellow jasper or quartzite

Jasper/quartzite; mainly microcrystalline quartz (SiO₂), with iron-oxide staining

Feldspathic Gneiss

Feldspathic Gneiss (High-grade regional metamorphic rock)

Labradorite-bearing gneiss or altered feldspathic rock

Plagioclase-rich gneiss, locally labradorescent; composition likely plagioclase feldspar, quartz, mica, and iron-oxide veining

Gneiss pebble

Banded gneiss, commonly quartz–feldspar–biotite gneiss

Possible granite or granitic gneiss pebble

Granite; primarily quartz, feldspar, and mica

Likely calcite fragment

Calcite (calcium carbonate, CaCO₃)

Micaceous schist (likely biotite schist)

Schist dominated by biotite mica, quartz, and feldspar

Blue mineral specimen, likely kyanite

Kyanite — Al₂SiO₅

Banded river pebble, likely quartzite or metamorphosed sandstone

Quartzite (quartz-rich metamorphic rock), possibly banded sandstone

Weathered quartzite

Quartzite; predominantly recrystallized quartz (SiO₂)

Quartz-rich vein rock, likely milky quartz in schist

Milky quartz (SiO₂) with probable mica schist/greenschist host rock

Likely iron-rich sandstone or weathered hematite-bearing rock

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂ with iron oxides such as hematite/goethite)

Jasper

Silicon dioxide (SiO2)

Pyrite-bearing rock (likely pyrite in quartz or altered host rock)

Pyrite, FeS₂, intergrown with quartz and/or iron-rich matrix

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Beige polished stone tile (likely limestone or marble)

Uncertain; probable calcite-rich limestone or marble (CaCO₃)

Schist (likely mica schist)

Mica schist, commonly quartz–muscovite/biotite schist

Pyrite-bearing sulfide specimen (likely pyrite)

Pyrite, FeS₂; possibly mixed with pyrrhotite or chalcopyrite

Tumbled milky quartz (likely quartz pebble)

Quartz, silicon dioxide (SiO₂)

Mica-rich schist, likely lepidolite or muscovite schist

Mica schist; predominantly muscovite KAl₂(AlSi₃O₁₀)(OH)₂, possibly lithium-rich lepidolite

Likely anthracite coal fragments

Anthracite; predominantly carbon (C), with minor mineral ash

Mixed rock and mineral specimen collection

Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens

Hematite

Iron(III) oxide (Fe2O3)

Decorative polished stone tile, likely white marble or limestone

Calcite-rich marble (CaCO₃), possibly veined limestone; exact identification requires testing

Weathered layered metamorphic rock, likely schist or phyllite

Micaceous quartz–feldspar schist/phyllite; exact identification requires a fresh surface and testing

Polished pyrite-bearing breccia (likely hematite/jasper with pyrite)

Iron-oxide-rich jasper/hematite breccia with disseminated pyrite (FeS₂); exact identification requires testing

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled quartz (likely rose quartz or included quartz)

Quartz, silicon dioxide (SiO₂)

Red Garnet (likely Almandine or Pyrope)

Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)

Likely slate or shale fragment

Slate; predominantly fine-grained clay minerals, quartz, and mica

Polished banded gneiss or amphibolite specimen

Biotite–quartz–feldspar gneiss, possibly amphibole-rich; exact identification requires testing

Likely limestone or marble fragment

Calcite-rich carbonate rock; CaCO₃

Schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, muscovite and biotite

Weathered mica-rich schist

Muscovite–biotite schist, possibly quartz-bearing

Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)

Quartz variety (SiO2) / Polycrystalline Quartz Aggregate

Honey calcite (likely rough cleavage fragment)

Calcite, calcium carbonate (CaCO₃)