Chap. V. ] blanfordite. I2T 
showing the extra face « (100), represents only one crystal, which 
is about 2 inches long in the direction of the d axis. With regard to 
the systematic position of this pyroxene it is at present impossible 
to speak with any certainty, since the mineral has not yet been analysed ; 
but as it seems to have some resemblance to the pyroxene from St. 
Marcel known as violan, which has been shown by Penfield^ to be a 
variety of diopside, it seems probable that blanfordite wiU also turn out 
to be related to diopside. In this same paper, on page 292, Penfield 
describes another pyroxene, which shows a very faint pleochroism in 
very pale rose and verv pale blue. An analysis of this p}T:oxene shows 
0-58% MnO and 1'06% Mn^Og and Penfield considers the pyroxene to 
be composed of about equal parts of diopside, jadeite, and acmite, 
with 3-0% of the molecule NaMnCSiO)^. 
What is probably blanfordite was also tomid at Eamdongri, also 
The Eanidongri occur- in the Xagpur dis;trict, where it occurs in the 
rence. manganeS2-ore body in a patch of a rock that 
is probably to be regarded as a granitic intrus-ive. This rock, noticed on 
page 8.57, is of rather fine grain and is composed of microcline, quartz, 
plagioclase, dnd perhaps orthoclase with some apatite, zircon, and 
brown mica. In sections of about the same thickness, however, the 
depth of the colour in the Ramdongri blanfordite is not so deep as in the 
Kacharwahi mineral. In some sections the c axis colour is greenish blue 
instead of p.ure blue. 
Monoclinic pyroxenes having exactly the same tj-pe of pleochroism. 
The Kajlidongri occur- only in much paler tints, also occur at 
rence. Kajlidongri, Jhabua State, and Jothvad, in 
Narukot State. It is not known at present whether these minerals are 
the same as the Kacharwahi pyroxene, but as they exhibit the same type 
of pleochroism, which can for convenience be called the Uanfordite type 
of pleochroism, they can be provisionally included under the term blan- 
fordite- The blanfordite of Kajlidongri occurs at the northern end of the 
deposit associated with the winchite-bearing schists mentioned later on 
page 150. These schists are to be regarded as the product of the 
metamorphism of manganiferous sediments, the typical rock thus pro- 
duced being composed of winchite, calcite, braunite, and quartz. 
1 Amer. Jour. Sci., XXXVI, page 293, (1893). 
