METEORITES OF NORTH AMERICA. 161 



Little further account has been given of the meteorite. 



Analysis was made by Madelung 2 on a specimen having a specific gravity of 7.42, with 

 the following result: 



Fe Ni Co P Inaol. 



92.099 . 7.530 Trace 0.001 Trace =99.63 



Brezina, 3 in his 1885 catalogue, speaks of the iron as follows: 

 Denton County is not well disclosed; kamacite somewhat puffy, bands 0.3 mm. wide. 

 Meunier 4 in 1893, describes it as follows: 



The kamacite is in pretty large bands, separated from each other at many points and only by fine laminae of tsenite. 

 The plessite is less abundant and is unequally distributed. The metal incloses numerous grains of schreibersite; no 

 pyrrhotine is visible. 



Small pieces of the meteorite are reported in various collections. The main mass is said 

 to be in the State Museum at Austin, Texas. 



BIBLIOGRAPHY. 



1. 1860: SHUMARD. Notice of meteoric iron from Texas. Trans. St. Louis Acad. Sci., vol. 1, 1856-1860, pp. 623-624. 



2. 1862: MADELUNG. Ueber das Vorkommen dee gediegenen Arsens in der Natur nebst den Analysen einiger neuerer 



Meteoriten. Das Meteoreisen von Denton County. Dissert. GSttingen, 1862, pp. 40-41. 



3. 1885: BREZINA. Wiener Sammlung, pp. 213, 214, and 234. 



4. 1893: MEUNIER. Kevision des fere meteoriques, pp. 52 and 56. 



Denver. See Bear Creek. 

 Denver County. See Bear Creek. 



DESCDBRIDORA. 



District of Catorze, State of San Luis Potosi, Mexico. 

 Here also Catorce (found 1885) and Agua Blanca (which has been lost). 

 Latitude 23 44' N., longitude 100 58' W. 



Iron. Medium octahedrite (Om) of Brezina; Schwetzite (type 15) of Meunier. 

 Known since 1780-1783; mentioned 1804. 



Weight: Two masses, one of 576 kg. (1,270 Ibs.), the otherof 41.5 kg. (90 Ibs.). The weight of other 

 masses referred to here is not known. 



In the view of Brezina 25 the following masses should be grouped here. He says: 



Under the name Descubridora are to be classed at least the following: 



(1) The large mass of 576 kg. weight which, according to Castillo, 21 was found before 1780 (or 1783) in the Descu- 

 bridora Mountains upon the Hacienda de Poblazon, and brought from there to the stamp mill of San Miguel. It was 

 there converted into an anvil, and later brought to the Hacienda del Tanque de Dolores, then once more to the 

 Hacienda San Miguel, and from thence to the Geographico-Statistical Society of Mexico, through the efforts of M. 

 Yrizar. The Vienna specimen agrees exactly with the Durango iron, and relatively with Pila, with Catorze, and with 

 the Descubridora specimen of Yale College. The kamacite glistens brightly, the tsenite is well developed, and the 

 fields resemble the bands. This iron is identical with that of the Hacienda de Vanegas (not Venagas), from which 

 I erroneously concluded that it was a hexahedral iron of nearly cylindrical form. 



(2) An iron from Descubridora put on the market by Ward and Howell, which was obtained from the Yale College 

 collection. This iron has straight, notched laminae of medium, almost fine, breadth, and with kamacite and plessite 

 in specks. 



(3) The iron of Catorze of 41.5 kg. weight, described by Geo. F. Kunz, now in the Vienna Museum, in which a 

 groove had been chiseled, evidently for the purpose of cutting off a fragment, in which there remained the broken 

 end of a copper chisel. The etched surface shows complete agreement with the first two irons and also great similarity 

 with Morito. 



(4) According to Fletcher, an iron of 4.5 to 5.5 kg. weight, in the possession of a certain Chialiva at Zacatecas. 



(5) The iron from Real del Guangoche, near Catorze. 



(6) The iron of Agua Blanca, near Catorze. 



The Charcas iron, which Fletcher indicated as apparently belonging also to the Descubridora iron, is provision- 

 ally regarded as an independent mass because of its somewhat finer figures, but especially because of the intermixture 

 of a peculiar powder-like substance. A thorough chemical investigation is necessary to determine accurately the 

 chemical constituents of this mass. 



716 15 11 



