eae 
84 W. P. Blake on the Gold Region of California and Oregon. 
creek these transparent plates are found in the Miocene strata; 
some of them are combined with the fibrous variety, and form 
beautiful cabinet specimens. Good crystals are also found in this — 
county, at the antimony localities. Thin transparent plates are 
numerous in the Miocene strata bordering the Colorado Desert, 
and on the borders of Carrizo creek they are found lying loose 
upon the surface where the strata have been worn away by the 
rains. Seams of gypsum are numerous in the tertiary strata of 
Benicia. 
“decom position a lime of the beds. 
imens of sulphur can be ob- 
y‘anNapa Valley. It occurs — 
r soil and tufaceous deposits — 
around the springs, and is in small crystals, forming drusy surfaces. _ 
- Beryt ?— Tnolumne Co.—Small and well formed hexagonal ” 
erystals having the hardness and color of beryl have been obtained — 
from the ‘Tuolumne river three or four miles from Jamestown. 
The specimens that ] saw were apple-green, and one of the small- 
est was emerald-green and transparent. The largest crystal was 
nearly 4 of an inch in diameter and terminated at both ends with 
the planes R, and —3, as in tourmaline. I was unable to retail’ 
the specimens for further examination. 3 
Tourmatine.—San Diego Co.—Black tourmalines of unustal 
size (from six to eight inches in diameter) occur abundantly in 
the huge feldspathic veins that traverse the granite ridges bor- 
dering the elevated valley of San Felipe, in the mountains be-— 
tween San Diego and the Colorado desert. These crystals are 
ct. 
F'e_pspan.—Ortuociase.—San Diego Co.—Good crystalliza 
tions of this mineral can be found in the granite veins near the — 
road between Santa Isabel and San Pasquale. They are associa 
ted with tourmalines and garnets. | 
_Anpatusite, Mariposa Co.—This interesting mineral was found — 
in great abundance in a conglomerate that caps the hills along — 
the Churchillas rivers (San Joaquin valley) at the crossing of the — 
road leading to Fort Miller. : 
* See also this Journal, [2] xix, p. 433. 
