234 
Transactioisis Texas Academy of Science. 
S'TREERUWITZ, W. H. VON. 
the Davis Mountains, extends through the Paisano and Mount Ord range 
to the Sierra St. Jago (Sa. Contrario), which runs down to the Rio 
Orande, forming the divide between the Pecos (Rio Puerco) and Rio 
iGrande above the mouth of the Maravillas creek.” P. 669. 
In Chapter IV, the following list of minerals [and rocks], from Trans- 
Pecos Texas, is given, with notes upon the localities of their occurrence: 
Quartz — Common; Milky; Granular; Mountain Crystal; Sagenitic 
Quartz; Lldventurine ; Flinty Quartz; Smoky Quartz; Agates, banded, 
- cloudy, and milky; Onyx. 
Amphibolite — 
Hornblende — 
Granite — iPine and coarse-grained, red and gray, chloritic, syenitic and 
ferruginous; granites with garnets and graphite; Talcose granite; 
Pegmatite ; Granulite. 
Porphyries — ^Argylophyre ; Melaphyre; Olygophyre; porphyritic trachytes, 
etc. 
Mica Schists — Also Talcose, chloritic, and hornblende schists. 
Mica — 
Feldspar — 
JMarbles — 'Dark gray, coarse-grained; lighter gray, fine-grained; yellow 
and peach-blossom shades, streaked, and mottled, very fine-grained 
white and pink; white and purple, etc. 
Calcites — 
Volcanic Rocks — Lava, compact and ‘ cavernous basalt, basaltic wacke, 
obsidian, retinite, and trachyte. 
Serpentine — Brown, oil green, brick-red and mottled. 
Iron — (Silicious magnitite and hematites; siderite; titanic iron; pyrites; 
gossan. 
Lead — ^Galena; carbonates of lead with silver; zinciferous lead oh’es with 
silver. 
Zinc Sulphides (Blende) — Pribramite (cadmiferous blende) ; marmatite; 
christophite. 
Antimony — 
Nickel — • 
Uranium — Torbernite; uranochre; uranpecherz, etc. 
Copper — ^Copper glanz; tetrahedrite; fahlerz; copper indigo; malachite; 
azurite; silicates; velvet copper ore; black oxide; red and blue carbo- 
nates; brown (red) oxide; peacock ore and pyrites; chrysocolla; 
atacamite; pseudo-malachite. 
Manganese — 'Wad; psilomelane; lampadite; crednerite (manganese and 
copper) ; pyrolusite. 
Silver — Native. 
Gold — ^T races. 
Tin — 'T races. 
Quicksilver Ore — ^Cinnabarite. 
