Geology and Mineralogy. 73 
8 As Cu i SS) Fe Sb 
2718. LTD: 42:23 BBA: 14) «6281 O08... = 10016 
This corresponds to the general formula 4RS, As,S,, or that of 
an arsenical tetrahedrite. It is described by Hj. jogren as occur- 
ring with galenite and geocronite at the Faln a in Sweden. 
— Geol. For, Fi depen tne Stockholm, v, 82, March, 1880 
Orizite :—Occurs in minute cryst tals and rystallisie grains, hav- 
ing the luster at ‘color of rice ies 8. spot: =6 ; specific 
ravity =2°245. T mposition is the same as that of heu- 
landite with which it is considere d tig the eciines G. Grattarola, 
as dimorphous. Locality: the tourmaline eranite of San Piero 
in Campo.— AZti Soe. Toscana, i es 
Pseudonatrolite :—Oceurs in minute colorless crystals, ay 
orthorhombic. Hardness =6 ; luster glassy to pearly. An analy- 
sis afforded : 
Sid. Al,0O; CaO MgO WNa,0,K,0 
62°64 14-76 8°54 tr. 100 = 101-76 
It is regarded as a new zeolite. Described by Grattarola Ne c.) 
clay like vein Mune with quartz and barite. When fresh it is 
colorless but ¢ isch rapidly i in the air, effloresces and becomes 
opaque. The composition is expressed by the formula MnSO,+ 
7 aq, or the same as the artificial salt. 
Luckite is found in indistinct striated Seis of a bluish color, 
occurring in a black bituminous rock. It p tig A belongs to the 
monoclinic system, The con osition, as ie n_by the a sie es 
corresponds to the formula (Mn, Fe) sO ra pd It is consequently 
near to cr but contains 21°7 
Guejarite :—Occurs with sidutite’? in ‘the copper veins in the dis- 
trite of Gaeer Andalousis, It is found in orthorhombic crystals 
of a steel gray color. Hardness =3°5; specific gravity =5-03. 
The chemical composition is given by hie rn Cu,S+258b,S, 
which places it near chalcostibite. Described by Cumenge and 
Friedel.— Bull. er mr sipehae epee 
Becearite:—A variety of zircon, di fferin ng from that mineral 
in Sher optically biaxial character, ana in composition, An analysis 
SiO, ZrO. Al,O; CaO gn 
30°30 62°16 2°52 3°62 032 = 98°92 
Brought by Dr. Beceari from Point de sere der and de- 
scribed by G. Grattarola.— Atti Soc. Tose., 
Mixite :—An emerald-to bluish-green aneeia’ s ss incrustation 
on lain ochre, and also in granular, and irregular massive par 
ticles, sometimes spherical i in form and in part orypto-crystalline. 
n analysis yielde 
ou Bi,O; CuO FeO Cad H,O 
13°07 43°21 1°52 0°83 1I8b = oat 
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