330 G. F. Kunz — Mineralogical Notes on Brookite, etc. 



is a rich reddish or yellowish brown, and they are free from 

 inclusions. In form and association they closely resemble 

 brookites from the Tyrol and from Maderananthal, Switzer- 

 land, lately described by P. Groth,* von Zepharovichf and 

 Zimanyi X The following planes were kindly identified for 

 me by Dr. S. L. Penfield of Yale University. 



a, 100. irl t, 021, 2-i n, 121, 2-2 



c, 001, x, 102, J-7 e, 134, f-3 



I, 210, i-2 y, 104, i-l Q, 234, £-* • 



//?. 110, / e, 122, 1-2 



The faces were small but gave him sufficiently distinct re- 

 flections for the identification of the forms ; the pinacoid a is 

 vertically striated. A distinct pleochroism was observed for 

 vibrations parallel to a pale yellow, and parallel to c reddish 

 yellow. Small crystals of an asparagus-green epidote 2 cm 

 long and 2 mm in diameter were also observed partly enclosed in 

 the crystals of quartz. 



Among a quantity of minerals brought to me for sale by 

 peasants at Ujakova, in the government of Perm, Ural 

 Mountains, was a crystal weighing 25*4 grams, which was 

 offered as garnet, but I at once recognized it as a monazite of 

 remarkable size. This crystal measures 33 millimeters in 

 breadth, 17 millimeters in length, and 11 millimeters in width, 

 and presents a simple form, showing the planes c (001, O), a 

 (100, i-l) and m(110, /). I was told that one of the "Roman - 

 ovskys, Russian mineralogists, — but which one I cannot ascer- 

 tain — had purchased two of these so-called "garnets " implanted 

 on crystals of albite, and one had been found at the same 

 locality some time before. 



Owing to the exploration at the ruby mines of Burma during 

 the last few years a number of very large ruby crystals have 

 been found in the ruby mines on the Moguk near Mandalay, 

 Burma. Some of these have weighed from 300 to 2,000 carats 

 — 61 to 410 grams each ; but they have all been translucent, 

 or only transparent in small spots, affording but little fine ruby 

 for cutting. They have, however, been cut up into very 

 interesting ruby asterias and poor colored ruby gems. One 

 crystal examined by the writer was a perfect hexagonal prism 

 measuring 29 mm in height and 31 to33 mm across the basal plane, 

 which was broader than the length of the crystal. It was 

 doubly terminated, and had trihedral rhombohedral markings 

 on each basal plane, visible also on the prismatic faces. This 

 crystal weighed several ounces and was valued at some £200. 



My thanks are due to Dr. S. L. Penfield for his crystallo- 

 graphical determinations. 



*Min. Samiiil. Strassburg, p. 110. f Zeitsclir. Kryst, vol. viii, p. 577. 



\ Foldtany Kozlony, sxi, p. 1 . 



