MINERALS. 273 
ALLANITE. 
From Platte Mountain, Douglas County, Colorado. Sp. gr., 3.52 at 29°. Analysis 
by L. G. Eakins. See Proc. Colorado Sci. Soc., vol. 2, p. 32. 
PREHBNITE. 
A. From Paterson, New Jersey. Analysis by G. Steiger. 
B. From Franklin Furnace, New Jersey. Collected by C. Palache. Analysis by 
Steiger. Sp. gr., 2.965. 
C. From Smiths Mountain, near Oak Grove, San Diego County, California. Sp. 
gr., 2.895 to 2.909. 
D. Crystals from C. Analyses C, D, by W. T. Schaller. 
E. From Fassa, Tyrol. Analysis by E. A. Schneider. 
A B Cc. D E 
Si OD -icreicferatssomsisinictes ataldiatcrertrciarete tei sieieaaeteiars ia eisianderecisms endian deter 42. 31 
AGO 3 sso 5 ceewckeemexsesensa eeeeesesredesweseseeeedieessexeee 19. 95 
FeO 9 sie.cs cos ssegaesieceess seek eresaeneeeeeseesssescsacee ay 6. 20 
FOO). iccjacinte ite Mec tisnr- Sena anes arene te bases DU Necee bate none 
CaO... 26. 63 
*MgO none 
IN 82O  sseiars heaton trareiare ore Senan aor cial mnainte Se eeaeais eS eEe ena Gel aiereisiesl 
ReO a sjccccciccmswaa cece am aweisinas me bis temaiars « xia s iesrarmniaejas aaibioraia ais lleareva'aie-soal 
ae * a sit E 21 x 
SOF AG 2502 = 300 ieee werent omer rnemsemecnarateireisiotim et aaicianm meee 
H.0 by ignition ssec.occcesa:scescescreecrsentesesseseaneseenes Hi 4.81 \ 4.85 
100.11 | 100.19 | 100.02 | 100.58 | 100.32 
TOPAZ. 
A. White, opaque topaz from Stoneham, Maine. Sp. gr., 3.51. 
B. Alteration product of A, greenish. Sp. gr., 3.42. Analyses A and B by J. E. 
Whitfield. See discussion by Clarke in Bull. 27. 
C. Topaz from Florissant, Colorado. Sp. gr., 3.578 at 22° Analyzed by W. F. 
Hillebrand, and described in Bull. 20. 
