Apatite (thin section)
Rating |
|
Name |
Apatite (thin section) |
Type |
Mineral |
Cleavage |
Not observed in thin section |
Colour and Pleochroism |
Most commonly colorless in thin section; Grains from deeply colored specimens may exhibit pale coloration; Weak to moderate pleochroism possible if colored |
Relief |
Moderate to high positive relief |
Form |
Usually occurs as euhedral to subhedral grains with a prismatic habit and hexagonal cross sections; Acicular habit common in igneous rocks; Anhedral grains, granular and columnar aggregates also common |
Optical Orientation |
Parallel extinction |
Twinning |
None |
Birefringence, δ |
δ = 0.001- 0.007; Maximum interference colors generally first order grey, basal sections may appear isotropic |
Optical Character |
Uniaxial (-) |
2V |
n/a |
Key Characteristics |
Moderate to high relief, lack of color, low birefringence and uniaxial character are key features |
Photograph Comments |
pic 1(left): plane polarized light, magnification 100x, arrows refer to basal sections of subhedral grains displaying hexagonal outline; pic 2(right): cross polarized light, magnification 100x, arrow refers to basal section with vertical optic axis resulting in an isotropic appearance |
Hand Sample URL |
http://digicon.athabascau.ca/u?/RM,93 |
Subject |
Minerals; Rocks; Identification photographs; Geology; |
Date |
2009 |
Format |
image/jpeg |
Identifier |
2009-rm-0001 |
Collection Title |
Rock and Mineral Samples |
Repository |
AU Digital Library |
Rights |
Subject to the Copyright Act |
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