58 



California Art & Nature. 



59 



Chrysoprase is a translucent, pale 

 bluish-green or yellow-green chalced- 

 ony. 



MAMMILLARIA BLEPHANTIDENS Lem. 



CORUNDUM— Reported from Los 

 Angeles county by Dana. 



CYANITE— Large quantities of sma-l 

 crystals occur in the Cargo Muchacha 

 district, on the Colorado desert. None 

 of gem value have been yet dis- 

 covered. 



DENDRITE — "Footprints of the 

 fern"; some beautiful specimens have 

 been collected on the Mojave desert, 

 by Mr. Ira J. Gray. 



DIAMOND — A small stone was re- 

 ported in 1898 as having been found in 

 Baja California, about 50 miles south 

 of Ensenada. Diamonds have not been 

 found in such numbers and size in 

 California as to render the search for 

 them profitable, but no serious pros- 

 pecting for them has yet been attempt- 

 ed. Itacolumnite or flexible sand- 

 stone, are alleged matrix of the dia- 

 mond has been reported from San 

 Diego county. 



DUMORTIERITE: Reported by Dur- 

 den as occuring 25 miles from Ogilby, 

 on the Colorado desert. 



A beautiful variety is found near San 

 Die^ro. 



ERYTHRITE— -Occurs at the Kelsey 

 mine near Compton, Los Angeles 

 county, Cal., associated with an ore 

 of silver and of cobalt in dark colored 



earthy masses in a gangue of lieavy 

 spar. This occurrence was noted in 

 1881, and is described in the report of 

 the state mineralogist for 1882, page 

 207, and in the fourth report, page 

 279. 



FLUORITE— Colorado desert, in a 

 massive form. 



GALENA — Lead sulphide, composed 

 of about 8B.6 per cent lead, and 13.4 

 per cent sulphur, is one of the heav'est 

 known ores, weigh'ng 461 pounds per 

 cubic foot, 4.34 cubic feet mak'ng a 

 ton. It occurs in consideable atund- 

 ance in some portions of the Colorado 

 desert, carrying a greater or le:s quant- 

 ity of gold and silver. 



GARNET— See Almandi'e. 



GILSONITE— A h3 drocarb n, rrpo t- 

 ed from Utah and Southern California. 



GRAPHITE— Plumbago or black ca 1 

 is a carbon like the diamond, with 

 some iron oxide and clay. A good 

 quality of this mineral occu'-s nea ■ h3 

 Jacumba valley, in San Diego coun'y, 

 California, in some abundance, bu' re- 

 mains undeveloped. It also occurs in 

 other parts of the country, but not in 

 suflicient quantities to be of any com- 

 mercial importance. 



GYPSUM— Sulphate of lime, w-e:i 

 pulverized the plaster of pans of co3i- 

 merce; when crystalized kr^wn as 

 selenite; the finer granular vari^^y is 

 known as alabaster. Comp sd cf abou 

 32.5 per cent lime, 46.6 per cent sul- 

 phuric acid and 20.9 per cent wate-. 

 Very abundant near Riverside, on ihe 

 Colorado desert and Baja California. 



HALITE— The salt fieds of the Colo- 

 rado desert, of San Quintin bay, and 

 of Scammons Lagoon, Baja Califo nia, 

 ensure San Diego an abundant supp'y 

 aside from her own product, and prom- 

 ise to add considerably to our com- 

 merce. 



HEMATITE — This iron ore occurs 

 sparingly on the Colorado desert, in 

 greater abundance on the Mojave des- 

 ert and in Baja California, whee the 

 writer obtained some fine specimens 

 of hematite in quartz in the Santo 

 Tomas valley. 



HYALITE, or Mullfr's glass— A var- 

 iety of opal, is described by T. Beck as 

 occurring in Bea\er valley, Utah. A 

 fine quality of this stone occurs near 



ITACOLUMNITE — Flexible sand- 



