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POPULAR SCIENCE REVIEW. 
1855 to 1876. He divides each series of eleven years into three periods, 
and finds that there are two minimum periods of four years at the beginning 
and end of each cycle, having between them a minimum period of three 
years. 
MINERALOGY. 
TJranocircite. — Weisbach has given this name (“ Jahrbuch fur Miner- 
alogie,” 1877, p. 406), to the interesting new member of the group of 
u uranium-micas ” which occurs in quartz veins in the granite of Bergen, 
near Falkenstein, in Saxon Voigtland. It is remarkable for containing 
baryta in place of lime, as the following analytical numbers show : — 
Uranium oxide . 
. 55*86 
Baryta .... 
. 14*57 
Phosphoric acid 
. 1506 
Water .... 
. 13*99 
100*48 
The percentage of baryta (14*57) differs but slightly from that required 
by theory (15*60). TJranocircite forms the fifth member of this interesting 
group. It is curious to find that half a century ago Berzelius detected the 
presence of baryta as well as lime in specimens of the u uranium-mica ” of 
Autun, while later mineralogists have found lime only. 
New Localities of Minerals in Scotland. — Professor Heddle, of St. Andrew’s, 
has met with quite a number of minerals in a block of granite, which was 
being used for building purposes near Tongue, in Sutherlandshire. He re- 
cognized the presence of amazon stone (a variety of orthoclase felspar, of a 
bright green colour), in isolated and twinned crystals, cleavelandite, lepi- 
domelane, pinite, fluorite, sphene, zircon, magnetite, ilmenite, allanite, 
smoky quartz, and a mineral which has been shown to be thorite passing 
into orangite. On a part of the surface of the block, about three square 
feet in area, twelve large crystals of amazon stone were seen, eight of these 
being unbroken and perfect ; one crystal of this mineral attained the length 
of 15£ inches, and measured 10 and 8 inches in the other directions. The 
block appears to have come from Ben Laoghal, a few miles inland to the 
north-west. 
Bunsenine. — This new mineral, a crystallised telluride of gold which 
occurs at Nagyag, and to which Krenner gave the name of Bunsenite, is 
now to bear the altered name of Bunsenine , as the former term had already 
been applied to a native oxide of nickel met with at Johanngeorgenstadt. 
Bunsenine occurs in small grey rhombic crystals on quartz. Its chemical 
constitution is not yet made known, but the analytical results obtained by 
Wartha will shortly be published. — Annalen der Physik und Chemie , 1877, 
i. 636. 
Homilite. — A new rhombic or monoclinic mineral, to which this name has 
been given, has been found by Paijkull at Stockhoe, near Brevig, associated 
with erdmannite and melinophane. It has a black, or brownish-black 
