Definitions of Gemological and Metallurgical Terms

Here are just a few definitions that are commonly misunderstood, or not understood at all.

Massive: in gemological terms, massive means a mineral that is present without any crystal structure; for example, see these two photos:

purple, fibrous, massive

purple, fibrous, massive (Photo credit: snigl3t)

Part of an Amethyst geode

Part of an Amethyst geode, crystalline, not massive (Photo credit: Wikipedia)

You see the one on the left have a regular crystal growth; the one on the right has no crystalline structure, therefore it is massive.

Oxidizing: Any oxidized substance is a substance that has grabbed on to, or attached with, Oxygen. Rust is oxidized Iron, tarnished Silver is just silver that has grabbed onto oxygen, and is covered with a small layer of it.

English: A rusty screw

English: A rusty screw (Photo credit: Wikipedia)

Tarnish

Tarnish (Photo credit: EllYouKayEee)

Weld: This means to fuse, or melt together, any to metals for a specific purpose. The most common technique for welding steel is with a torch, where a torch is applied to the joint where the two steels are to be welded, and they are melted together, sometimes with the help of a separate steel rod to fill in the holes and void. Heating up the two steels and pounding them together with a hammer is also a way to weld, as the force and heat fuse the two surfaces into each other.

Not bad for a first try!

Not bad for a first try! (Photo credit: Gregory Wild-Smith)

Welding bead

Welding joint (Photo credit: jack chance)

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