Metamorphic Or Sedimentary Depending On Local Grade

Greenschist

Greenschist (chlorite-epidote schist)

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Caribbean Calcite

Calcium Carbonate with Argonite (CaCO3)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Greenstone (metamorphosed basalt)

Greenschist / Meta-basalt

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Milky Quartz

Quartz (SiO2)

Native Gold Nugget

Native Gold (Au)

Schist

Mica Schist

Greenstone

Metabasalt / Chlorite-Epidote Schist

Garnet-Mica Schist

Schist (variety with Almandine Garnet, Fe3Al2(SiO4)3)

Quartzite

Quartzite (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Veined Quartz

SiO2 (Silicon Dioxide)

Quartz (pebble)

Quartz (SiO₂)

Schist

Schist

Sandstone or Mudstone with Iron Staining

Ferruginous Sandstone/Mudstone

Fluorite (likely)

Calcium Fluoride (CaF2)

Garnet (Almandine/Pyrope series)

Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)

Rainbow Moonstone with Black Tourmaline

White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Garnetiferous Quartzite (Garnet Gneiss Pebble)

Garnet-bearing Quartzite or Quartz-Feldspar Gneiss

Lapis Lazuli (Lazurite crystals on Marble)

Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]

Rhodonite

Manganese Silicate (Mn, Fe, Mg, Ca)SiO3

Quartz

Quartz (SiO₂)

Sandstone Concretion

Sedimentary concretion

Serpentine

Serpentine-group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Quartz

Quartz (SiO₂)

Corundum (Sapphire/Ruby in Matrix)

Aluminium oxide (Al2O3)

Quartzite with Chlorite

Metamosphosed Quartz Sandstone (SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2 inclusions)

Hypersthene

Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)

Jasper (likely Polychrome or Mookaite variants)

Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions

Banded Gneiss

Gneiss (pronounced "nice")

Jadeite Jade

Jadeite (NaAlSi2O6)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Slate

Foliated Metamorphic Rock (composed mainly of Quartz, Illite, and Chlorite)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Rose Quartz

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

Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz with Chlorite or Hornblende inclusions

Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions

Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions

Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule