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Posted: **July 27th, 2014, 5:55 am**

John Richardsim wrote:
Answer (Click to Show Hidden Text)
1. Talc 2. Gypsum 3. Calcite 4. Flourite 5. Apatite 6. Orthoclase 7. Quartz 8. Topaz 9.Corundum 10. Diamond
What is drusy crystal habit?

Answer (Click to Show Hidden Text)

Crystals forming in a vug/ gap in surface of rock

Posted: **July 28th, 2014, 10:45 am**

Alright, I'm just going to go all out rebel and ask another fossils question.

How and when were banded iron formations (BIFs) formed? (Hint: the answer can be found on this page if you scroll down a little bit: http://petrifiedwoodmuseum.org/Precambrian.htm)

Posted: **August 8th, 2014, 10:26 am**

:) (Click to Show Hidden Text)

Banded iron formations, known as BIF's, are ancient sedimentary deposits consisting of alternating layers of iron rich and silica rich layers. BIF's started out as sediments deposited on ancient ocean floors.

Posted: **August 14th, 2014, 11:43 am**

Fossils Question!!!

What is the most recognizable feature of genus Phacops?
[Hint: it is a trilobite...]

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Rocks & Minerals B/C ID/Question Marathon

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