MINERALS. 285 
MESOLITE. 
A. From North Table Mountain, Golden, Colorado. Described by Cross and Hille- 
brand in Bull. 20. Analysis by W. F. Hillebrand. 
B. From Osteré, Faroe Islands. Analysis by G. Steiger. 
A. B 
BIO corm nacs tomes Wes a duty rye a eaiea ah px annua aing tried amniands ys Raladialadend Mosiapewin ata anand ae 46.17 45. 97 
AkO. 26. 88 25. 98 
CaO 8.77 9. 69 
ae 6.19 4.79 
5 ee eelexccares none 
FeO At: LOS? aim scp secoseie Gig a ctessie te 2 eae am Reie copiers dente ced SAR ATS aR REE Soa e/SEM EINE eee \ 12.16 1.34 
FIG O: ABOVE MOG ajs.n2ie faceisls Roce Gomlnestel eeiann ee hentnmeSeeenatiae Seabee Ma eiase Seis Seam cients i 12.04 
100. 17 99. 81 
THOMSONITE. 
From Table Mountain, Golden, Colorado. Described by Cross and Hillebrand in 
Bull. 20. Analyses A, B, C, D, Eby W. F. Hillebrand. Analysis F by George 
Steiger; published in Bull. 207. A represents reddish spherules; F, a mass of fibrous 
structure. : 
Naz 
HO 
100.06 | 100.07 | 100.02 | 100.08 | 100.01 | 100.40 
HYDRONEPHELITE. 
From the elzolite syenite of Litchfield, Maine. Described by Clarke as a new 
species in Bull. 42. Analyses by F. W. Clarke. Sp. gr., 2.263, determined by J. S. 
Diller. 
A, B. Slightly impure. Two distinct samples. 
C. Carefully purified material dried at 100°. 
MUSCOVITE. 
A. From the Hatch farm, Auburn, Maine. Broad plates, bordered by lepidolite. 
Analysis by R. B. Riggs. 
B. Greenish muscovite, Auburn, Maine. Analysis by E. A. Schneider. 
C. Altered muscovite, Mount Mica, Paris, Maine. Occurs as a white enamel on 
ordinary mica. Analysis by F. W. Clarke. 
D. Well-crystallized muscovite from the hiddenite mine, Stony Point, Alexander 
County, North Carolina. Analysis by F. W. Clarke. 
E. White muscovite from Miask, Ural Mountains, Siberia. Analysis by E. A. 
Schneider. 
