1889.] Mineralogy and Petrography, 26 1 
MiNERALOGlCAL NEWS. — New Minerals.— DaklHte' occurs 
as a yellowish white incrustation on red apatite from the Ode- 
garden mine at Bamle, Norway. It is found in little fibres 
. with a density of 3.053 and a composition as follows : 
CaO FeO Na,0 K,0 PA CO, H,0 
53.00 .79 .89 .11 38.44 6.29 1.37 
corresponding to 4 (Ca, Fe, Na^, K,) 3 (PO.), + 2 Ca CO3 + H,0. 
Before the blowpipe the mineral decrepitates without fusing. 
It is uniaxial and negative. — Endidymite'^ is founa in tabular 
crystals in the elaeolite syenite of Langesundfiord at Aro, 
Norway. It is a white mineral with an easy basal cleavage, a 
hardness of 6, and specific gravity of 2.553. It is minoclinic 
with a: b \ c= 1.7107 : i: 1.1071 and ^5 = 86*' 14' 27". 
The plane of its optical axis is the clinopinacoid. The acute 
bisectrix is inclined 58^^^ to c in the acute angle ^9. 2Ya = 
29° 55 ' for yellow light, and the dispersion is inclined with 
c > V Its analysis yielded : 
S:03 BeO Na,0 H,0 
72.19 1 1. 15 12.66 3.84, corresponding 
to Na. H. Be. Si , O,. 
—Lansfordite is a white mineral resembling calcite. It is de- 
scribed by Genth' as forming stalactites 20 mm. in length in an 
anthracite coal mine at Lansford, Schuylkill Co., Pa. Its 
composition is Mg0^23.i8 per cent, CO, = 18.90 per cent, 
H,0 .= 57.79 per cent, = 3 MgCOs + Mg (OH), + 2 H,0. Its 
hardness is 2.5, and specific gravity 1.692. — Rare Mijierals. — 
Messrs. Diller^ and Whitfield have identified the blue mineral 
present in fibres penetrating the quartz and plagioclase of the 
pegmatoid portion of a biotite gneiss at Harlem, N. Y., as de- 
mortierite. In thin section the mineral is seen to have a cleav- 
age parallel to 00 Po5 and a second parallel to some prismatic 
plane. It contains long tubular cavities parallel to the vertical 
axis and is frequently polysynthetically twinned parallel to 
some plane in the prismatic zone. It has a hardness of 7, and 
specific gravity of 3.265. The analysis of a specimen of the 
mmeral obtained from a rock composed principally of dumor- 
tierite and quartz, from Clip, Arizona, yielded : 
J ' Sroggerand Backstrom: Oefv. af. Kongl. Vetenskaps Akad. Forh. Stockholm. 
