Metamorphic Or Sedimentary Depending On Local Grade

Likely weathered metamorphic rock (possibly schist or gneiss)

Indeterminate; probable mica-rich quartz–feldspar metamorphic rock

Grey River Pebble (Likely Quartz-rich or Limestone)

Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)

Soapstone Carving (Pipestone/Catlinite possible)

Steatite or Argillite

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly SiO₂), possibly ferruginous mica-bearing quartzite

Tumbled pale-green stone, likely serpentine

Serpentine-group minerals, broadly (e.g., antigorite or lizardite); identification is uncertain from the image

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Kyanite

Kyanite (Al2SiO5)

Fuchsite

Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Quartz-rich sandstone or quartzite fragment

Quartz sandstone; possibly weakly metamorphosed quartzite (SiO₂-dominant)

White Marble

Recrystallized Calcite Rock (CaCO3)

Kyanite

Kyanite (Al2SiO5)

Large granite boulder

Granite, a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar, and mica

Granite Boulder

Felsic Intrusive Igneous Rock

Gemstones (Emerald and Yellow Topaz or Citrine)

Beryl (Be3Al2Si6O18) and Quartz (SiO2) or Topaz (Al2SiO4(F,OH)2)

Dark shale or slate fragment

Carbonaceous shale, possibly low-grade slate; composition mainly clay minerals, quartz, and organic carbon

Gneiss

Feldspathic biotite gneiss; a high-grade metamorphic rock composed mainly of quartz, feldspar, and mica

Blue Sapphire and Diamond (Set in Metal)

Corundum (Al2O3) and Diamond (C)

Weathered iron-rich metamorphic rock (probable amphibolite or schist fragment)

Likely hornblende–plagioclase amphibolite with biotite/chlorite alteration; exact identification requires testing

White Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Banded gneiss (likely weathered paragneiss)

Gneiss; quartz–feldspar–mica ± amphibole assemblage

Jadeite Jade

NaAl(Si2O6)

Greywacke (Briarcliff Schist/Gneiss)

Manhattan Schist / Fordham Gneiss complex

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Chert (specifically Yellow Jasper)

Sedimentary Cryptocrystalline Quartz (SiO2)

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Iron-rich quartzite or silicified ironstone

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite and possibly hematite

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite

Granitic Pegmatite with Tourmaline and Sphalerite

Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)

Biotite-bearing schist (likely mica schist)

Mica schist, commonly quartz + biotite ± muscovite; composition varies

Weathered gray metamorphic rock, likely slate or phyllite

Fine-grained foliated metamorphic rock; commonly quartz–mica–chlorite, possibly chlorite phyllite

Polished mica-rich metamorphic sphere

Likely mica schist or garnet-mica schist; exact identification is uncertain from the photograph

Diorite

Diorite (Intermediate intrusive igneous rock)

Chlorite-rich schist (probable greenschist)

Chlorite–quartz–mica schist; commonly derived from basalt or shale under greenschist-facies metamorphism

Dragon Blood Jasper

Epidote with Red Jasper (Quartz-rich aggregate)

Dark gray metamorphic cobble, likely slate or phyllite

Foliated metapelite; possibly slate/phyllite composed mainly of quartz, mica, and chlorite

Likely blue-green schist

Chlorite–epidote schist (tentative visual identification)

Amber-bearing rough specimen

Fossilized plant resin (amber; organic mineraloid), commonly succinite

Mica Schist

Schist (muscovite/biotite rich regional metamorphic rock)

Banded gneiss

Gneiss; typically quartz–feldspar–mica assemblage