








ectangular prism with ig ee — and ee, 
andl the three axes a e bas 
vertical prism. 
— ral axis, c, having for the axes a, 5, the ratio 
a:1b; extende 
constitute a brachydome, or dome parallel to. to the 
shorter lateral axis, and Ped the ratio 
? 



42 J. D. Dana on the Homeomorphism 
TABLE I. 
Angle of Vertical Prism near 90°. 
bag: Macrodome. | Brachydome, Axes. 
Trism 
eae o Le 231% Lies 4 O22 6 ive 
L 
Thomsonite, - - - -| 90°40’| 108° 187 ° 5610-72253 : 1: 1°0117 
esotype,- - - - -| 91°  |(27)108° 48/2709? 42/0°71644 : 1 : 10176 
Harmotome, - - - -| 91° 46’ 08° 48’ 71626 : 1: 10312 
ohlerit - = -1 90° 54). 1089 00-7261 :1:1:01588 
Pyrolusite, - - - - 93° 40’ 104° 29/\(an107° ey, 0°77601 : 1 : 1:0661 
Andalusite : . 0° 44", 109° 6) 109° 198 : 1: 10129 
write, - - - |(#)91 111° 14] 112° 40/.0-68429 : 1: 10271 
Staurotide, - = = |(4)93° 87\(47)108° 121 111° 10’10-79388 : 1: 1:05617 
vellite, - - (4)90° 84//(27)106° 14/1 106° 46/10°75047 = 1: 1:0099 
Aas, ee See Sear Oo aay co Anes oe eg 
Libethenite, - => = 92° 30 108° 28 110° 50’10-72034 : 1: 1:0446 
Caledonite, - - - - 5° (42)105° 8/\(3%)109° 54/10-76568 : 1 : 1:0913 
Chondrodite,- - - -| 94° 26'(47)106° 52’\(47)111° 4’ orai76 : 1: 10805 
Antimony Giaiies, are 90° 45/ Sad 26/1(2%)110° 8/10°6901 : 1: 1:0132 
0. do. - =} 90° 45’(12) 88° (12) 88° 471-035 132 
Polycrase,- - - - -| 96°  {{1z) § 38° 30’(12) 98° 5811-09666 ; 1: 10918 
Despore: - - = = =} 90° 34" 120° 4% 190° 8340-57657 : 1: 1°01 
Diaspo - = = =| 98952" 115° 16’) 118° 49710-63398 : 1: 10699 
Gatite, - a ee 94° 59/ BR Sarg 117° 30/10°66063 : 1 : 1:0888 
Polian an Oe a ok 52! 115° 26’ 118° 06317 :1:1:0513 
achrane - - - - LT? met 19° 1310-6088 :1.: 10388 
Pepa? Pu boss) 2% layas 4 (@gniis° 2’(42)118° 10’10-63258 : 1 : 1:05617 
Chrysolite, - - - -| 94° 8/ (47)115° 36/199 12/6297 :1:1:078 
Triphyline, te ee ($2)118° 277\(4%)121° 55/\0:59549 : 1: 10724 
Bournonite, - - - one 40’ ($7)115° —{(%)1 18° 14’10'63745 : 1 : 10662 
i Se Ne aro (12) 92° 84/17) 96° 1210-95618 : 1: 1066 
# Warwickite, - - =|. 98°-949 
?Lanthanite, - - - 93° 45/| 




la: 

ron, having 
it is therefore # the wnit 
3 aa angles are planes of 
the axes a, b,c, = la:16:le; 
J med 
me sneha Cae 
tween species; all other angles are 
& QOMC: 

Lo ied 
le. 





uit Scheie Peres Ae Ki 


slew! ie angle Osa 
‘le 
i eee 


i 


and there 
bition of the degree of home 
are dependent upon these, an 

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