Synthetic (Ceramic)

Feldspar (Microcline / Orthoclase)

Potassium Feldspar (KAlSi3O8)

Magnetite / Hematite mix

Magnetite (Fe3O4) and Hematite (Fe2O3)

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)

Ironstone Concretion (Limonite/Goethite)

Ferruginous concretion (Fe2O3·nH2O)

Pink potassium feldspar (likely orthoclase)

Orthoclase, KAlSi₃O₈; possibly intergrown with other feldspars

Potassium Feldspar (Orthoclase / Microcline)

KAlSi3O8 (Potassium Aluminum Silicate)

Milky Quartz

Silicon Dioxide (SiO2)

White quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Red gemstone ring, likely synthetic ruby or red spinel

Ruby: corundum (Al₂O₃); spinel: MgAl₂O₄; exact identity requires testing

Opalite

Synthetic Opalised Glass

Opalite

Synthetic Opalised Glass

Opalite

Synthetic opalescent glass

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Opalite

Synthetic Opalized Glass

Bronze or iron-age decorated pottery sherd

Archaeological ceramic fragment; likely fired clay with impressed or molded decoration, not a natural rock

Porcelain Tile (Sandstone-look)

Man-made Ceramic (resembling Quartz-rich Sandstone)

Iron-rich rock, possibly limonite/goethite

Hydrated iron oxides/hydroxides, commonly limonite (FeO(OH)·nH₂O) with goethite (α-FeO(OH))

Ferruginous Sandstone

Clastic Sedimentary Rock (Iron-rich)

Ruby Lavender Quartz with Amethyst

Silicon dioxide with neodymium dopant (SiO2)

Limonite Concretion

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)wnH2O)

Rounded sandstone pebble

Quartz-rich sandstone, likely arkose or lithic sandstone

Rainbow Hematite / Magnetic Hematite

Iron oxide (Fe2O3) - often synthetic/coated for beads

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Red gemstone, likely ruby

Corundum (Al₂O₃), colored red by chromium; identity cannot be confirmed from the photo

Star sapphire ring

Corundum (Al₂O₃), likely asteriated sapphire

Diamond (or Cubic Zirconia)

Cubic Carbon (C) or Zirconium Dioxide (ZrO2)

Likely blue-green kyanite crystal

Kyanite, Al₂SiO₅

Likely feldspar (rough specimen)

Probably potassium feldspar, KAlSi₃O₈; exact identification is uncertain from the image

Red-orange feldspar crystal (likely orthoclase)

Potassium feldspar, KAlSi₃O₈ (likely orthoclase)

Blue-gray kyanite crystal

Kyanite, Al₂SiO₅

Milky Quartz

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Likely feldspar (weathered, cleaved fragment)

Probably potassium feldspar, KAlSi₃O₈ (orthoclase or microcline); identification from the photo is provisional.

Pink feldspar fragment (likely potassium feldspar)

K-feldspar, typically orthoclase or microcline; KAlSi₃O₈

Pink feldspar crystal

Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈

Likely blue-green kyanite

Kyanite, Al₂SiO₅

Tumbled feldspar-rich rock, likely pink-orange microcline or granite fragment

K-feldspar (microcline/orthoclase), approximately KAlSi₃O₈; exact identification requires testing

Feldspar (Plagioclase / Orthoclase)

KAlSi3O8 / CaAl2Si2O8 - NaAlSi3O8

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) in Granitic Pegmatite

Limonite

FeO(OH)·nH2O