662 The American Naturalist. [July, 
and redingtonite. Cinnabar from the New Idria Mine, -California, has 
a prismatic or rhombohedral habit, with the basal plane and a series 
of rhombohedra and tetarto-trapezohedrons well developed. The 
crystals are made up of layers of dextro- and lxvo-rotatory material. 
At Knoxville acicular crystals occur with -R, and oR. They encrust 
metacinnabarite that occurs in seams in a vesicular marcasite. An 
analysis gave: HgS = 98.48; FeS=.69; SiO, =.71. Analysis of 
redingtonite and knoxvillite yielded : 
SO, ALO, CrO, FeO, FeO NiO MnO MgO Res H,O at 100° ° 
R 35:36 5.14  7.5i+. «38 - 4.58 3.00 tr, 1.85 3.46 27.09 
Ki 35.0% 4.84 7.41. 35.360 3-81 835 3-22 1.74 9.30 
H,O above 100° 
R. 
K 17.60 
Copiapite in soft masses and sulphur-yellow scales and crystalline 
particles contains: 
SO, FeO, FeO MnO MgO H,O 
39-97 26.54 -46 -21 3-06 30-43 
Stromeyerite from the Silver King Mine, San Bernardino county, Cal., 
has a specific gravity of 6.28, asteel-gray color on a fresh fracture, and 
n coiiposition : Ap =< 53:06; Cass 98.58; Pes 26; S ax 16.51; 
Res = 1.55. The rare chromium chlorite Koftschudeite is found in 
the serpentine at Green Valley, Cal., as thin, hexagonal plates 
arranged in rosettes. The plates are twinned monoclinic crystals, with 
an optical angle of about 30°, and an acute bisectrix nearly normal to 
oP. The type mineral from the Urals is in apparently hexagonal 
pyramids. The composition of the California mineral is: 
SiO, 1,0; ARO; FeO MiO CaO MgO 
35-74 11-39 674... iai 487... 183 35-18 
Loss at 105° Loss above 105° 
-365 12.68 

In a note on some Canadian minerals Mr. Harrington ™ mentions 
the existence of géthife crystals, forming a velvety druse on hematite, 
calcite, and other minerals at Clifton, N. S. At the same place radiat- 
ing needles of the iron compound are found capped with rhombohedra 
of calcite, One specimen yielded: Fe,O,= 88.92; Mn,O,=.14; 
H,O = 10.20; SiO, =.32. A white to pale apple-green serpentine 
occurs as veins in a darker serpentine at an asbestos quarry near 
13 Can. Record of Science, Vol. 1V., No. 2, 1890. 



