Mineralogical Specimen

Likely weathered iron-rich sandstone or laterite

Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Weathered iron-rich sandstone or ironstone

Ferruginous sandstone, likely limonite/goethite-cemented quartz arenite

Weathered sandstone block

Quartz-rich sandstone, likely arkose or calcareous sandstone

Small rounded orange-brown stone, likely iron-stained quartzite or sandstone

Indeterminate; probable quartz-rich sandstone/quartzite with iron-oxide staining

Drill Core Sample

Cylindrical Rock Core (Specific mineralogy varies by extraction site)

Polished red jasper cabochon

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

Sea stack

Likely resistant basaltic to andesitic volcanic rock

Iron-rich concretion or weathered ironstone nodule

Goethite–hematite-rich limonite concretion (tentative)

Dendritic Agate (or Dendritic Opal)

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

Granite

Felsic intrusive igneous rock

Likely metallic meteorite fragment

Undetermined iron or stony-iron meteorite; mineralogy requires testing

Sandstone masonry blocks

Clastic sandstone, primarily quartz (SiO₂) with feldspar and lithic grains

Conglomeratic breccia (possibly polymictic volcanic breccia)

Polymictic breccia; clasts in a fine-grained volcanic or sedimentary matrix

Weathered quartz-rich rock, possibly chert or quartzite

Indeterminate; likely microcrystalline quartz (SiO₂), possibly quartzite or chert

Desert Rose Fragment (Atypical) / Weathered Chert

Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Weathered granite pebble

Granite, chiefly quartz (SiO₂), feldspar, and mica/amphibole

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Chert (specifically Silex or Flint)

Microcrystalline Quartz (SiO2)

Concretion (likely iron-rich sandstone or claystone concretion)

Diagenetic carbonate/iron-oxide concretion; exact mineralogy requires testing

Banded Gneiss

Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)

Banded greenstone or altered basalt

Chlorite–epidote amphibolite/greenstone; exact identification requires testing

Rounded iron-rich concretion or weathered lateritic pebble

Goethite/hematite-bearing ferruginous concretion; exact mineralogy requires testing

Weathered foliated metamorphic rock, likely schist or gneiss

Micaceous quartz–feldspar metamorphic rock; exact mineralogy requires testing

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Granite

Granite

Polished banded gneiss pebble

Gneiss, chiefly quartz–feldspar–mica; exact mineralogy uncertain from image

Porphyritic Rhyolite or Andesite (Porphyry)

Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Rose Quartz

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

Weathered sandstone or siltstone

Clastic sedimentary rock, likely quartz-rich sandstone; exact mineralogy requires testing

Gneiss

Gneiss (a type of metamorphic rock)

Banded River Rock / Gneiss (highly weathered)

Gneiss

Flagstone, likely weathered sandstone or limestone

Layered clastic carbonate rock; exact mineralogy cannot be confirmed from the image

Iron-rich meteorite candidate

Undetermined stony-iron or iron meteorite; mineralogy likely Fe–Ni metal with silicates

Likely small metallic meteorite fragments

Unclassified iron or stony-iron meteorite; mineralogy cannot be confirmed from the image

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

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

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

Polished pale stone, likely limestone or quartzite pebble

Most consistent with micritic limestone (calcite, CaCO₃), though the image cannot confirm mineralogy

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)