350 Screntifie Intelligence. 
10. A preliminary Report on the Marbles of Georgia; by S. 
W. McCattiz. Bulletin No. 1, Geol. Survey of Georgia, W. S. 
Yeates, State Geologist.—This bulletin presents au account of 
the marbles of Georgia and the general condition of this industry 
at the present time. It is interesting to note that this State, in 
which the production for 1893 was valued at $261,666, stands 
second in the country in its production of marble. Vermont 
comes first with an output for the same year valued at $1,621,000 
and New York third with one of $206,926; while for Tennessee 
and Maryland the corresponding values were $150,000 and $i30,- 
000 respectively. 
11. On some Swedish minerals ; by Hs. Ss6arun.—A recent 
number of the Bulletin of the Geological Institution of the Uni- 
versity of Upsala (vol. ii, part I, No. 3) contains an important 
article by Sjogren on some Swedish minerals (pp. 39 to 108). 
The subject of the chemical composition of the minerals of the 
Humite-Chondrodite group is reviewed with new analyses by 
Mauzelius on carefully selected material. The formulas derived 
are as follows: 
Chondrodite: -- .. 22222-- Mg,| Mg(F.OH) |,(Si0,), 
EMumine teen Ck SAA) Mg,| Mg(F.0OH) |,(Si0,), 
Clinohumite_-.....-...- Mg,|Me(F- ORD sigs 
These formulas agree perfectly with those deduced independently 
and a little earlier by Penfield and Howe (this Journal, xlvii, 
188, March, 1894). 
In continuance of the same subject a description is given of 
PROLECTITE, a new mineral of the above group. This, owing to 
lack of material, has been only partly investigated thus far. It 
crystallizes in the orthorhombic system and its relations to the 
other species is as follows : 
Ratio of vertical axes. 
Prolectite, {hi Shue BP ea ae 3 
Chondrodite: 2 Sse ic eee 5 
iinmites 0 ee ee ve 
Clnohumite 22.22 ke ae 9 
With the three long known species the ratio above given is also— 
as first shown by Penfield and Howe—that of the magnesium 
atoms present (see formulas above). This fact led the authors 
named to suggest the probable discovery of another member of 
the group with the formula Mg[Meg(F.OH)],Si0,, and although 
prolectite has not yet been analyzed it is urged by Sjogren that 
its composition will probably be found to conform to this. The 
name (from zpoleyezy to foretell) alludes to the fact that its 
existence was thus predicted. 
A description is also given of Rerzian, a new arsenate from 
the Mossgrufva, Nordmark. It occurs in small orthorhombic 
crystals imbedded in a mixture of dolomite and braunite. They 
have a chestnut-brown or chocolate-brown color; hardness about 
