CALCITE FROM THE EBURRU STATION HYDROTHERMAL LOCALITY
Calicte occurs both in the form illustrated below and as fiberous needles. In addition, there is a mineral with a structure very similar to that illustrated below, but is translucent and often very, very pale blue. It usually occurs as a ring of crystals which circle a vug like a bathtub ring. Occassionally, they form an arch. This mineral is more resistant to acetic acid than normal calcite.
5-7-86 No. 92 5KV APER200 x200 by CMN
|MAGNIFICATION FIGURES ARE FOR THE ORIGINAL SEMs, NOT FOR THE IMAGES YOU SEE ON YOUR COMPUTER SCREEN. I WILL BE ADDING SCALE BARS WHEN I HAVE TIME TO DO THE CALCULATIONS.|
White to colorless. Commonly in this form or in small white, three-sided spikes. Occurs in vugs with chabazite and stellerite.