Sedimentary (Processed Mineral Product)

Botryoidal Hematite (Kidney Ore)

Iron(III) oxide (Fe2O3)

Concrete-like limestone or cemented carbonate rock

Likely limestone (calcium carbonate, CaCO₃); exact identification is uncertain from the image

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Likely blue kyanite

Kyanite, Al₂SiO₅

Quartzite

Quartzite (SiO2)

Tumbled lavender quartz (likely lepidolite-bearing quartz or dyed quartz)

Quartz, SiO₂; possible lepidolite mica inclusions

Quartz (Tumbled/Water-worn)

Silicon Dioxide (SiO2)

Dyed Blue Agate (Dragon Vein Agate)

Silicon Dioxide (SiO2) with artificial cobalt/organic dyes

Native gold-bearing sulfide specimen

Native gold (Au), likely intergrown with pyrite (FeS₂) or chalcopyrite (CuFeS₂)

Sulfur-bearing iron ore, likely pyrite-rich gossan

Pyrite (FeS₂) with iron oxides/hydroxides and dark host rock

Gold-bearing quartz in a dark host rock (possible gold-in-quartz specimen)

Quartz (SiO₂) with possible native gold (Au) in a fine-grained host; exact identification is uncertain from the photo

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Iron-stained weathered pebble

Likely ferruginous sandstone or iron-rich chert; exact identification requires testing

Blue Kyanite

Kyanite (Al2SiO5)

Honey calcite (optical calcite)

Calcite, calcium carbonate (CaCO₃)

Kyanite

Aluminium Silicate, Al2SiO5

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Obsidian (likely black volcanic glass)

Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition

Manufactured stone veneer wall

Likely cut limestone or sandstone masonry blocks; exact lithology is indeterminate from the image

Polished ocean jasper / orbicular jasper

Microcrystalline quartz (SiO₂), commonly with chalcedony, feldspar, and iron/manganese oxides

Polished dendritic agate or jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Blue Onyx (Dyed Agate/Chalky Chalcedony)

Silicon Dioxide (SiO2) with artificial pigment

Chrysocolla-rich copper ore

Chrysocolla, a hydrated copper silicate; composition is variable and commonly mixed with quartz or copper oxides

Quartz-rich pegmatite (likely milky quartz with mica)

Quartz (SiO₂), with possible muscovite/biotite mica; exact rock identification is uncertain from the photo

Blue calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Faceted blue gemstone ring, likely synthetic spinel or glass; identity uncertain

Possibly synthetic blue spinel (MgAl₂O₄) or laboratory sapphire (Al₂O₃); the clear side stones may be cubic zirconia or glass

Black tourmaline (schorl), probable

Schorl tourmaline, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Likely mica-bearing metamorphic rock (possibly schist)

Mica schist, composed mainly of quartz and mica (muscovite and/or biotite); identification is approximate from the image

Rounded quartz-rich pebble

Quartz-bearing lithic clast; exact rock type indeterminate from image

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Rounded, weathered stone (likely basaltic or andesitic river cobble)

Fine-grained mafic to intermediate volcanic rock; exact identification requires examination of a fresh surface

Yellow Jasper

SiO2 (Silicon Dioxide)

Red Jasper

Jasper (Silicon Dioxide with iron oxide inclusions), SiO2

Yellow calcite

Calcite (CaCO₃)

Decorative polished stone tile, likely white marble or limestone

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

Weathered iron-rich limestone or altered volcanic rock

Probable limonite/goethite-bearing calcite rock; exact identification requires testing

Granite

Felsic intrusive igneous rock

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (C10H16O)

Heat-Treated Amethyst (Commercial Citrine)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

Banded brown jasper (likely picture jasper)

Silicified microcrystalline quartz/chalcedony (SiO₂), commonly iron-oxide stained

Kyanite

Al2SiO5

Blue Kyanite in Quartz

Kyanite (Al2SiO5)