Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)

Emerald in Host Rock

Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium

Rough Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Ironstone (Limonite/Hematite)

Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Sodalite and Calcite

Na8(Al6Si6O24)Cl2 (Sodalite) and CaCO3 (Calcite)

Ironstone Nodule (Ironstone Concretion)

Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Emerald

Beryl (Be3Al2(SiO3)6)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Scoria (Lava Rock)

Scoria

Serpentine

Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Emerald

Beryl (Be3Al2Si6O18) with trace amounts of Chromium and/or Vanadium

Emerald in Matrix

Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities

Sodalite

Na8(Al6Si6O24)Cl2

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Quartzite

Silica (SiO2) quartzite

Sodalite in Matrix (often called Blue Marble or Sodalite-Syenite)

Sodalite-bearing Syenite / Na8Al6Si6O24Cl2 (Sodalite component)

Red Quartzite (Strawberry Quartz)

Quartzite (SiO2 with iron oxide inclusions)

Ironstone Concretion (Limonite/Goethite)

Ironstone (primarily FeO(OH)·nH2O)

Snowflake Obsidian

Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)

Sandstone (with manganese staining)

Clastic sedimentary rock (primarily SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Blue Apatite

Fluorapatite / Chlorapatite [Ca5(PO4)3(F,Cl,OH)]

Sandstone Concretion

Septarian Concretion (Nodule)

Scoria

Vesicular Basalt / Scoriaceous Basalt

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartz Sandstone

Blue Quartzite (Aventurine)

Quartzite (primarily SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone

Arenite

Quartzite

Metamorphic Rock (Mainly SiO2)

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Zircon

Zircon (ZrSiO4)

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)