«isa 
404 J. D. Dana on the Feldspar group of minerals. 
R # Si Bases: Silica Non-alk.: Alk. 
1. Paranthite Retiree aly 24:1 
2. Wernerite ee ee Pere adhe. ed 4 
3. Ekebergite ee ae | a eee ta fs . non-alk, | 
4, Dipyre Aged @ yt. c8 : 1 | 
Asa fuller exposition of the facts, the ratios for the more 
satisfactory analyses, from which the above mean results have 
been deduced, are given in the table followin ng. The number- 
ing of the analyses in Rammelsberg’s work is added for the 
convenience of reference. 
R % §&__ |Bases Silica ; Non-alk.: Alk | 
2 Pargas Storgard, Nordenskiaid 1:26: 3:6 1: 1:00 | Allnon-alk. 
4, Tunaberg, as oe 1: 3-493 1: 105] * “ 
3, a Nas Bogtiies Pim ce dic | Reed ROM 
3, > Pargas, Ioeby, ¢ Mor... LiB2 s4-4.4 8 ¢ POT eae 
7, Pane (Ersby?) ag Woe... 1:29:45 1.Tie} “itis 
_ 8, Pargas, Ersby, v. Rath ....._.2_. 129% 49 1: 1:20} 615:1 
9, ORs VRID boise 1:17:34 | 1: 1:24] 265:1 
tig: oryst., Co 1:18:36 1:21:27] 645:1 
16, L. Baikal, Glaucolite, v. Rath _____ 1:21: 4 1: 1:28} 3:90:1 
15, Bolton, pink, Wurtz -_......._... 1:18:37 | 1: 1:30} 250:1 
ee oe THOMBOR se jhe 5s 1: 2:0: 4:0 1: 1:33) 570:1 
14, Drothems, pink, Berg 1:20:40 | 1: 1:33] 403:1 
22, Bolton, pink, Wolff. 1:29:43 | 1: 135] 384:1 
17, Malsjé, blue mass., v. Rath_.____ --| 1:17:40 1: 1:38} 536:1 
18, Finland, gnh., Wolff... ......... ae 1:138| 3°98:1 
25, Malsjé, pink, ete., Wolff___.._____ > oF: as 1: 142} 1:89:1 
24, sm Ekebergite, Hartwis eS as ae 7. 1°43 3°05 1 
23, Hesselkulla, Wonhs., WOlle 2! 355 1:22:45 1: 144) 246:1 
28, Hesselkulla, Herm ee > ae 1: 146 Sr 4 
24, pends, Wolff. 1:21:45 | 1: 147| 2:06:12 
ndal, OIE oi emo did Jens 1:21:47 1: 150} 235:1 
26, Malsjo On mnie.y. Bath oo 1:21:46 1 > PhO 1 eae 
ae Goren rneur, sity +i ree 1:165| 1:24:1 
D. 
1: 1°74} 1:32:1 
£: FIL} .102:2 
1: 1:°92| 1:26:1 
i eae | 0-95: 1 
1: 1°89] 0-80:1 
_ The four groups A, B, ©, D, correspond to those above 
named Paranthite, Wernerite, | Ekebergite, and Dipyre. Analy- 
mad No. 9, of an Arendal Scapolite diverges rather Leow from 
the mean of the group ; but the specimen was proba 
normal one in some way, as the results are quite ike thos? 
obtained from Arendal’ specimens by Wolff and Damour o 
* The analyses omitted are 
Rate of lime; those Gao 9 ty rere Sete tate ee) uch ne 
. T1828 of aliered scapolites; those of little hardness, thereby rea 
omen analyses of glancolite by and Givartovski, 
"ys oteeadi Rath has shown is of uncertain nature, and not true glaucdlite. 
om 
