Sedimentary Or Metamorphic (Low Grade)

Coquina / Shelly Sandstone

Calcareous Sandstone / Coquina

Ironstone Concretion / Limonite Specimen

Goethite and Limonite (Hydrous Iron Oxides)

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Jadeite (Jade)

Jadeite; NaAlSi2O6

Prase quartz with actinolite inclusions

Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Sapphire (Blue/Violet Rough)

Corundum (Al2O3)

Jadeite Jade

Jadeite (NaAlSi2O6)

Tumbled ruby or ruby-bearing corundum

Corundum (Al₂O₃), red variety colored mainly by chromium

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hematitic Sandstone

Sandstone with Hematite inclusions (SiO2 + Fe2O3)

Anthracite Coal

Anthracite

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Weathered slate or phyllite

Foliated metamorphic rock, commonly quartz–mica–chlorite assemblage

Tumbled tiger’s-eye

Quartz variety with fibrous crocidolite pseudomorphs; SiO₂

Unakite (likely)

Epidote–orthoclase–quartz rock; composition approximately epidote Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH) plus K-feldspar and quartz

Veined marble or calcitic limestone

Calcite-dominant carbonate rock (CaCO₃), likely marble

Dark metamorphic rock, likely slate or phyllite

Fine-grained foliated metamorphic rock; commonly dominated by quartz, mica, and chlorite

Polished banded stone, likely tiger’s-eye

Tiger’s-eye quartz (fibrous chalcedony/quartz, SiO₂), possibly iron-rich quartzite

Greenstone (Chert)

Microcrystalline Silica (SiO2) with chlorite/epidote inclusions

Soapstone (steatite), possibly talc-rich schist

Steatite; predominantly talc, Mg₃Si₄O₁₀(OH)₂, with possible chlorite, mica, and carbonates

Engraved polished dark stone (likely slate or basalt)

Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing

Greenstone Celt (Polished Stone Axe)

Metamorphosed mafic rock (often Basalt or Diabase)

Anthracite Coal

Anthracite

Epidote with Quartz and Feldspar

Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)

Fine-grained dark metamorphic rock, likely slate or phyllite

Slate/phyllite, composed mainly of mica-group minerals, quartz, and clay-derived minerals

Tumbled milky quartz

Quartz (SiO₂), microcrystalline or massive variety

Ironstone Concretion

Ironstone (Siderite/Limonite/Goethite)

Conglomerate

Conglomerate Rock

Ironstone Nodules in Chalk/Limestone

Limonite/Goethite concretions (FeO(OH)·nH2O) in Calcium Carbonate matrix (CaCO3)

Ironstone Concretion

Ferruginous Sandstone / Siderite Concretion

Ironstone Concretion (Limonite/Goethite)

Ironstone (composed primarily of Goethite FeO(OH) and Limonite)

Limonite Concretion

Limonite (FeO(OH)·nH2O)

Tumbled quartz-rich pebble, likely jasper or chert

Microcrystalline quartz (SiO₂), possibly iron-stained jasper

Reddish foliated metamorphic rock, likely phyllite

Phyllite, typically quartz–mica–chlorite with iron-oxide staining

Serpentinite (likely)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, commonly with magnetite and minor carbonates

Quartz / Quartzite

Silicon Dioxide (SiO2)

Tumbled brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)

Quartz with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate [Ca2(Al,Fe)3(SiO4)3(OH)]

Greenstone, likely altered basalt (possibly serpentinite)

Metabasalt/greenschist; commonly chlorite–actinolite–epidote ± serpentine

Tumbled greenstone, likely serpentine or altered basalt

Probable serpentinite (Mg-rich phyllosilicates, chiefly antigorite/lizardite) or chlorite-rich basalt