06/03/19

The different types of plagioclase?
The fractions of albite $\\ce{NaAlSi_3O_8}$ and anorthite $\\ce{CaAl_2Si_2O_8}$, which I call $\\ce{Ab}$ and $\\ce{An}$ in the following list, present in a plagioclase are often used to define it... more
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04/28/19

Where can fluorite be found on Long Island, New York?
I'm interested in fluorite (Since Fluorine is my favorite element, and I wanted a sample of it, even if bonded, but I don't want to buy it; that would be no fun), and I'm curious if it can be found... more
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04/11/19

What is a good definition of the word "rock" for teaching?
Note that it needs to include coal and chert, therefore the common answer "a rock is made of minerals" is incomplete.
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