(Lab14)_Biaxial_Interference_Figures_F10

(Lab14)_Biaxial_Interference_Figures_F10 - Optical...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Optical Mineralogy Lab 14 – Fall, 2010 Biaxial Interference Figures
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Biaxial Sign: B x a Figures To determine the optic sign of a biaxial mineral from a BX A figure, position the isogyres so that the melatopes are in the NE and SW quadrants There should be an area near the melatopes that shows a 1 o gray interference color Observe this area as you insert the 550nm or 1 o red compensator
Background image of page 2
3 Biaxial Sign: B x a Figures If the 1 o gray area in region between the two isogyres turns yellow, the mineral is biaxial positive If the 1 o gray area inside of both the isogyres turns yellow the mineral is biaxial negative
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Biaxial Sign: Centered OA Figures Optic axis figures probably provide the easiest method for determination of optic sign because grains with an orientation that would produce an OA figure are perhaps the easiest to find Place the isogyre so that the inside of the isogyre is in the NW quadrant Find the area that shows 1 o gray close to the melatope Observe this area as the 550 nm compensator plate is inserted
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 12/13/2010 for the course GLY 4200c taught by Professor Warburton during the Spring '10 term at FAU.

Page1 / 13

(Lab14)_Biaxial_Interference_Figures_F10 - Optical...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online