100 
EARTHS. CALCAREOUS. 23. Magnefiata. 
granularh. 
f.exuosa. 
spatosa. 
23, MAGNESIAT A. Confifting of carbonate of 
lirr.e, a little black oxyde of manganele, carbonic 
acid gas, and water : hardifh, lamellar, fponta- 
neoufly leparating into grains : gradually chang- 
ing the colour of its furface when expofed to the 
air, effervelcing (lowly with acids, and often 
not without trituration : becoming black in the 
fire. 
Subopake, tranquil in the fire, breaking into indetermi- 
nate fragments, of a common form. 
Sidero-calcite. Kir^-van mineral. l. 105. < 
Brown fpar. Schmeiffer mineral, l. p. 2 24. 
Brown fpar. ’Thomjon chem. 3. p. 612. 
Found in various parts of Ger?nany, Snaeden, France, &.C. i'* 
large malfcs : colour white, flefli and rofe-colour, greyifl*’ 
yellowilh and reddifh-white, with frequently an irride.'ceu' 
nietallic appearance : generally opakc, and becomes brownilb 
when expofed lome time to the air: fpecilic gravity 2,837'. 
contains carbonate of lime 50. oxyde of iron 22. oxyde oi 
raanganefe 28. Bergman, 
Shining internally, making a grey mark, breaking int<’ 
indeterminate fragments, with the foliations iit'- 
curved, 
Kant. Lejke mineral, l.p. 274. 
Hoffmann Berg. Journ. 1789. i. p. 191, 
Found in liercynio, and near Camjdorf and Scharbenberg\’i\ Snut" 
den, rtddilh or greyilh-tvhite. 
A little fliining internally, making a grey mark, breaking 
into rhomboidal fragments, with the foliatiop* 
ftraight. 
Karst. Lejke mineral. l, f. 273. 
Hoffmann Berg. Journ, 1789. I, p. 189. 
1. Of a common form, 
2. Kidney- fhaped. 
3. Cryftallized; the cryftals often very fmall, fometimes fcatteW’ 
fometimes clullered in aferies. 
a. Lenticular. 
Common. 
Curved li.ke the beak of a fadd’e. 
b. Rhombic. 
With the faces fiat. 
With the faces convex. 
