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Any advice distinguishing diatomite from chalk? I don't have a Rocks & Min box to practice with, so I'm afraid I'm a bit rusty in physical identification.

Magikarpmaster629 wrote:

dechirico wrote:Awesome! Now, next question:
1. ID the mineral. 2. What kind of rocks does this specimen most widely occur in?

Hmm, 1. Albite plagioclase 2. Felsic igneous rock

Ahhh, sorry for the delay. You're right, though!

TPBM has never done a lab event.

Nah. I've done Chem Lab and Crime Busters. Granted, I didn't like them very much, so now I stick to Earth Science events.
TPBM is currently procrastinating on Physics homework.

Anyone else notice that actinolite and tremolite are the same mineral with differing percentages of Magnesium and Iron? What could be used to differentiate? Well, tremolite is much cheaper, so it'll most likely be that in competitions :D On a more specific note, I've noticed that actinolite is a sl...

Awesome! Now, next question:
1. ID the mineral. 2. What kind of rocks does this specimen most widely occur in?

Ah, that makes sense. Answer below: 2. Nonclastic-- it's formed through evaporation

Let's hope this is right: 1. Travertine 2. Sedimentary (limestone) 3. Deposits by mineral springs