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Id 55
Identification Type Mineral
Name Microcline
Distinguishing Features tartan-twinned
low-birefringence
Description Transparent colorless. Nonpleochroic. Low order birefringence colors. Distinctive twinning pattern from the intersection of pericline and albitic twins ("tartan plaid" or "cross-hatched") in cross-polarized light is virtually diagnostic of microcline. Tabular and cleavage fragments. Moderate relief.

See also feldspar.
Tags silicate
plaid
tartan
cross-hatch
twinned
feldspar
cleavage
transparent
colorless
External Resources Microcline on MinDat
Imposters
Images
Unique Identification: Microcline
Site name: Lake of the Woods
Light type: Plane-Polarized Light
Magnification: 630.0
Submitted by: Val Stanley
Notes: 90 degree cleavages
Image Tags: transparent
Unique Identification: Microcline
Site name: Lake of the Woods
Light type: Cross-Polarized Light
Magnification: 630.0
Submitted by: Val Stanley
Notes: Note diagnostic twinning pattern.
Image Tags: cross-hatched-twinning tartanplaid
Unique Identification: Microcline
Site name: Lake Eyasi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Microcline
Site name: Lake Eyasi
Light type: Plane-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none
Unique Identification: Microcline
Site name: Lake Eyasi
Light type: Cross-Polarized Light
Magnification: not specified
Submitted by: not specified
Notes: none
Image Tags: none