Mineraloid

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)

Hypersthene

Enstatite (Hypersthene variety), (Mg,Fe)SiO3

Iron-rich weathered rock, possibly limonite/goethite-bearing ore

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with hematite and other oxides possible)

Granite

Felsic intrusive igneous rock

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing

Sea stack

Likely resistant basaltic to andesitic volcanic rock

Granite

Granite

Banded amphibolite (hornblende-rich metamorphic rock)

Amphibolite; predominantly hornblende ± plagioclase, with possible biotite and quartz

Polished green-inclusion stone, likely chlorite-included quartz

Quartz (SiO₂) with chlorite inclusions; exact identification is uncertain from the photograph

Banded Calcite (Onyx Marble / Travertine)

Calcite (Calcium Carbonate, CaCO3)

Serpentinite (probable)

Serpentinite, dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with dark magnetite or chromite and pale carbonate/talc possible

Dragon Blood Jasper

Quartz (SiO2) with Epidote and Piedmontite inclusions

Tumbled gray stone, likely serpentinite or weathered basalt

Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph

Chert (Green River Chert)

Microcrystalline Quartz (SiO2)

Breccia (likely volcanic or impact breccia)

Polymictic breccia; clasts in a fine-grained silicate matrix, exact mineralogy indeterminate from image

Tumbled dark gray stone, possibly basalt or andesite

Fine-grained mafic to intermediate volcanic rock; exact mineralogy cannot be confirmed from the photograph

Tumbled sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli

Tumbled mica-rich stone, likely muscovite schist

Muscovite-bearing quartz schist; chiefly muscovite mica, quartz, and possibly feldspar

Polished orbicular granite (likely K2-type granite)

Granite, chiefly quartz, alkali feldspar, plagioclase, and dark amphibole/biotite; possible epidote-rich orbicules

Likely iron-rich meteorite fragment

Undetermined stony-iron or iron meteorite; mineralogy may include Fe–Ni metal, troilite, and silicates

Brown agate or chalcedony cabochon pendant

Microcrystalline quartz (SiO₂), likely brown chalcedony/agate

Tumbled greenstone/serpentinite pebble

Serpentinite, chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄; identification is visual and uncertain

Polished blue-green feldspar-rich slab, likely amazonite

Amazonite, green microcline (KAlSi₃O₈), possibly with quartz and albite inclusions

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Banded River Rock / Gneiss (highly weathered)

Gneiss

Banded Calcite (commonly traded as Green Onyx / Travertine Onyx)

Calcite (CaCO3) / Travertine

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Greisen

Greisen

Polished red jasper cabochon

Jasper; microcrystalline quartz (SiO₂) with iron-oxide impurities

Gneiss

Gneiss (a type of metamorphic rock)

Orbicular basalt (amygdaloidal basalt)

Basalt, commonly with iron-oxide–stained amygdules; matrix chiefly plagioclase, pyroxene, and often olivine

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Chert (specifically Silex or Flint)

Microcrystalline Quartz (SiO2)

Onyx (Calcite Onyx / Mexican Onyx)

Calcium Carbonate (CaCO3)

Likely polished leopard-skin jasper or brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image alone

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Likely weathered porphyritic igneous rock

Provisional identification: altered basaltic-andesite or rhyolite; exact mineralogy cannot be confirmed from this close, flash-lit image

Banded Calcite (Green Onyx / Onyx-Marble)

Travertine / Calcite (CaCO3)

Possible iron-rich meteorite

Provisional: stony-iron or iron meteorite; mineralogy may include kamacite (α-Fe,Ni) and taenite (γ-Fe,Ni)

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Ocean Jasper (Orbicular Jasper)

Silica (SiO2) with varied mineral inclusions