67 
TAB. CCXXXIV. 
Sprcu.atep Gypsum is also new in description, as far as E 
know ; and from what has been said, such a thing could 
hardly be expected. It is, however, necessary that any mi- 
neral should be known, in whatever form or variety it may 
be; and Gypsum being at present so much recommended 
as a manure, makes it not less necessary, as otherwise Gyp- 
sum might be brought to manure Gypsum, or be refused 
by those who prepare it, as useless. 
This is a pretty and delicate variety. The crystals are 
much confused, but seem to be a mass of trapeziurns—see 
tab. 67—piled or formed into little spires; the points of 
the trapeziums being mostly inclining upwards. It came 
from Derbyshire. The under specimen might be considered 
as a red or rose-coloured Gypsum. They are often coloured 
with red Oxide of Iron, in various degrees. This specimen 
appears of rather an uncommon form; the crystals are 
something like the above, but lie horizontally ; and it would 
seem as if the whole was a sort of Stalagmite, having fallen 
into this form in a particular state. 
I received this specimen by favour of my kind friend 
Dr. P. Murray, from the limestone quarry at Bilton in 
Yorkshire, along with another very instructive one, part 
of a larger mass, with a vein of whiter striated Gypsum , 
passing into it, holding almost orange-coloured, or deeper 
tinged, perhaps, primitive rhombs within it—see the left 
hand figure and right hand geometrical one. This varety is 
sometimes compact and hard enough to be turned and 
polished for ornaments. 
