2007-01-13 08:35:20 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
To my knowledge, there is not a transparent orthoclase feldspar, though the mineral can have a glassy luster.
One gem variety of feldspar, moonstone, is translucent (semi-transparent). If it is possible to cut it into thin enought slices, perhaps it would then appear transparent.
edit addition:
saudipta c, thank you for your input. I probably stand corrected. The luster specifically of moonstone is likely designated pearly, not glassy. I learned the luster of orthoclase feldspar can be either glassy or pearly. The following link may confirm, though any information is only as reliable as the researcher:
http://www.windows.ucar.edu/tour/link=/earth/geology/min_feldspar.html
2007-01-13 09:06:37 · answer #1 · answered by Anonymous · 0⤊ 0⤋
All the minerals of feldspar group are transparent under a petrological microscope. That means if you cut it fine, light can pass through it, unlike some ore minerals which are always opaque. But in handspecimen it appears opaque.
Incidentally, the lustre of orthoclase feldspar is pearly and not glassy.
2007-01-14 12:56:32 · answer #2 · answered by saudipta c 5 · 0⤊ 0⤋
Orthoclase feldspar is often found in transparent crystals which are cut as gemstones for collectors but are not very popular for jewellery making as the stone is not very hard and scratches easily. The most common colour is a pleasing pale yellow.
2007-01-15 06:35:43 · answer #3 · answered by U.K.Export 6 · 0⤊ 0⤋
I've never seen a transparetn orthoclase feldspar. Every type of feldspar I've ever seen has been opaque.
2007-01-13 18:35:48 · answer #4 · answered by Casey B 2 · 0⤊ 0⤋
a potassium feldspar: K AL silicate framework silicate.
Rock forming mineral found in earth's crust.
2007-01-17 13:05:44 · answer #5 · answered by Laura Marie B 3 · 0⤊ 0⤋
Adularia. If you're looking for the answer to the Telegraph GK crossword.
2007-01-14 16:16:47 · answer #6 · answered by Simon H 1 · 1⤊ 0⤋