Quality Classification of Muscovite Mica Based on Visual Properties
V-1
Clear
Highest Quality		 V-2
Clear and
Slightly Stained		 V-3
Fair Stained		 V-4
Good Stained		 V-5
Stained A Quality		 V-6
Stained B Quality		 V-7
Heavy Stained		 V-7A
Densely Stained		 V-8
Black Dotted		 V-9
Black spotted		 V-10
Black Stained		 V-10A
Densely Black
& Red Stained
Crystallographic Discoloration X *d *d *d * * * * * * * *
Very Slight X * * * * * * * * * * *
Slight X X * * * * * * * * * *
Medium X X X *e *f * * * * * * *
Heavy X X X X X * * * * * * *
Cloudy Stains X X X X X X *g *h * * * *
Light Black and
Red Dots (Mineral)		 X X X X X *d *d *h * * * *
Black Stains
(Mineral)		 X X X X X X X *g X *d *g *h
Red Stains
(Mineral)		 X X X X X X X *g X X *d *
Black and Red
Stains (Mineral)		 X X X X X X X X X X X *
Green Stains
(Vegetable Type)		 X X X X *d *g *g * * * * *
Clay Stains X X X X X *d *g * X X *d *d
Nearly Flat * * * * * * * * * * * *
Slight X X * * * * * * * * * *
Medium X X X * * * * * * * * *
Heavy X X X X X * * * X X X *
Hard * * * * * * * * * * * *
Soft X X X X X X S * X X X S
Stones and Holes X X X X X X X X X X X X
Buckles X X X X X X S *g X X X X
Reeves X X X X X X X X X X X X
Ridges X X X X X X S *g X X X X
Tears X X X X X X X X X X X X
Cracks X X X X X X X X X X X X
Hairline Cracks X X X X X X X X X X X X
Wedge X X X X X X X X X X X X
Tangle Sheet X X X X X X X X X X X X
Herringbones X X X X X X X * X X X X
Sand Blast X X X X X X S * X * * *

Symbols
Permissable *
Not Permissable X
Permissable Only If Specified S
Few And Tiny In 1/4 Of Usable Area a
In 1/2 Of Usable Area b
Very Dense c
Slight d
In 2/3 Of Usable Area e
Uniformly Distributed f
Medium g
Heavy h