F. OTHER COMMON UNIAXIAL MINERALS
quartz (1,2,3,4,5,6) and calcite, which you should now be able to identify on you own, are the
most common rock forming minerals that are uniaxial. There are a number of other
uniaxial minerals of interest which may form accessory minerals in some of the
common rock types and these are available for you to study .
I. Some of these ---
apatite,
BH-250-37
brucite,
88-C5 ask me
to show you this one
beryl,
BH-I am working on this
nepheline,
BH-I am working on this
rutile,
BH- I might have a thin-sections , ask me to show you)
tourmaline,
BH-250-26
vesuvianite
(idocrase). I am working on this
Look at the above minerals if they are available and make a table of important
characteristics. Record only things you observe.
II. Look at slides of Nepheline (1,2) bearing rocks. What is nepheline? Look up the
optical characteristics of these minerals and see if you can identify them in
these slides. Look around at other minerals in these slides, do you see any
other minerals that you can identify? Is quartz (1,2,3,4,5,6) present? If not why do you think
it might be missing?
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