Kyanite, Sillimanite, and Andalusite Deposits of the Southeastern ...

Paragonite.
Margarite.
VB-116a...
VB-116b. . .
VB-116a: Typical
colorless mica with
good micaceous
cleavage.
VB-116b: Colorless
bundles of fibers and
poorly defined plates
with a slight waxy
luster.
1.48
2.1
.79
5.22
5.6
4.9
O.OX percent
Li.
1 . 6 percent Ca .
4 . 9 percent Ca ;
0 . X percent
Li.
Paragonite; film No.
6880. By F. A.
Hildebrand. 4
Paragonite plus muscovite
and minor
kaolinite. By H.
S. Yoder, Jr.
Margarite. By H. S.
Yoder, Jr.
1.595
3 1 . 604
1.613
3 1.604
1.618
0-5°
325°
Chemical analyses
by J. M. Dowd
and J. D.
Fletcher.
Chemical analyses
by P. L. Elmore.
Chemical analyses
by P. L. Elmore
and J. D.
Fletcher.
1 X-ray powder camera method used by D. H. Richter, F. A. Hildebrand, and J. M. Axelrod.
X-ray diffractometer method used by H. S. Yoder, Jr.
2 See complete chemical analysis in table 5.
3 Approximate.
4 The absence of muscovite and kaolinite in this material suggests that it was not identical
with material analyzed by H. S. Yoder, Jr.
CO?
quartz (fig. 8). dant inclusions
quartz and rock are unoriented some abun- contain aggregates. Kyanite crystals kyanite-
nonfoliated in ing rock, may irregular
network
the
form it
kyanite may rock, irregular stringers occur
form- (fig. 7).
kyanite-quartz Mountain In nonfoliated strongly kyanite quartzite is in foliated Willis
principal kyanite occurrence lenses of massive kyanite many length. lenses of massive feet in The kyanite crystals (fig. 6),
few inches across or (fig. 5), randomly the foliation clusters of oriented aggregates radiating crystals of conformable to generally only nite, across, inches found few are pure kya- through Aggregates nearly the rock. of
deposits. Kyanite may in some form coarse-tufted
described, kyanite uniformly
distributed rather
(h). (r) ; Rutile holes section Crossed in nicols.
coarsely crystalline quartz (q) (k) gneissic and characteristic
structure. County,
well-developed kyanite crystals Prince Edward Va. Shows bladed
Photomicrograph kyanite quartzite Mountain, FIGURE 3. of from Baker
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