I come in many colors. Although I have a cubic crystal stucture, I tend to break into octahedrons. It might surprise you that I have weak fluorescence. What am I?

My name stems from the Latin word fluere meaning to flow in reference to my low melting point and use as a flux in the smelting of metals.

Answer 1

"I might be fluorite... if you're British."

~ signed, fluorite

Fluorite can be colored by impurities.

Fluorite comes from the latin "fluere", as clearly shown here.

It is obviously used as a flux in the smelting of iron, added to metal ores to lower their melting points...

At least British fluorites are weakly fluorescent, but in general fluorites with impurities are quite fluorescent...

It apparently crystallizes into cubic structures, but can cleave into octahedral structures.

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Answer 2

Serenity Allen

Diamond.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.