230 



University of California Publications. [Geology 



This constitutes the first notice of hrochantite from this 

 locality. 



Anglesite. — Specimens of galena with small colorless angle- 

 site crystals were lately collected at the Cerro Gordo mine by 

 Mr. John Reid, and given to this department. The anglesite 

 crystals are somewhat flattened parallel to the base and elon- 

 gated in the direction of the a-axis. They are terminated on one 

 end by the sharp pyramid (122) and joined to the matrix by the 

 other end. See plate 20, fig. 5. 



c (001) m (110) z (111) o (011) 



a (100) I (104) y (122) 



Measured Calculated 

 <P P <t> P 



c 



001 



0°00' 



0°00' 



0°00' 



0°00' 



a 



100 



90 00 



90 00 



90 00 



90 00 



in 



110 



52 00 



90 00 



51 51 



90 00 



1 



104 



90 00 



22 20 



90 00 



22 19 







Oil 



00 



52 11 



00 



52 12 





1 1 1 



51 51 



64 14 



51 51 



64 24 



.'/ 



122 



32 28 



56 49 



32 28 



56 49 



The base is striated parallel to its length, but all the other 

 faces are very bright and perfect, 



II. — Celestite prom San Bernardino County. 



When colemanite was discovered in Southern California it 

 was observed that celestite was its associate, occurring as good 

 crystals in the geodal masses of colemanite. As the forms of 

 these crystals have not been stated, the writer measured a few 

 of them. 



The celestite from the Calico district is generally in broad 

 plates, tabular to the base and grown together in parallel posi- 

 tions. The habit of these crystals is seen in plate 20, fig. 6. 



The observed forms were : 



c (001) d (102) o (011) 



m (110) I (104) 



A strikingly different habit for celestite is seen in a specimen 

 of colemanite from Death valley. The crystals appear like long 

 slender prisms terminated on one end by a sharp pyramid and 

 attached by the other end to the matrix. They are, however, 

 elongated in the direction of the a-axis, and consist principally of 



