Crystals

question mark article explains what crystals are in mineralogy

Culet

culet

Cullinan Diamond

Cullinan Diamond

Dendrite

Dendrite

Derbyshire Blue John

derbyshire blue john vase with lid on display in London's Natural History Museum

Duke of Devonshire Emerald

large question mark adjacent to a smaller faceless figure who's wondering about the answer to a question

Ephod

Ephod

Etheric Body

etheric_body

Firescale

firescale

Gemmy

image of a translucent faceted gemstone

Gemstones

a collection of faceted coloured gemstones

Geode

question mark page explains what a geode is

Goldstone

goldstone 1a

Heat Treatment

large red questions mark adjacent to a small faceless figure who's gesticulating that he's wondering about the answer to a question

Heliotrope

heliotrope_aka_bloodstone

Igneous Rocks

igneous rock

Inclusions

inclusions

Iridescence

Iridescence

Iron

rough chunk of iron article talks about this mineral

Iron Ore

iron ore

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