EARTHS. CALCAREOUS. 24. Plcrofpatum. ici 



c. With a fingle pointed 6-rided pyramid. 

 The pyramids lolid. 

 The pyramids hollow. 



Found in the mines of Hercyma and Saxony^ diaphanous, fub- 

 opakc, rarely opake : colour cinereous, reddifli or yellowifh,- 

 white, ifabella, roly, flefh-colour or brow nifh- red, yellowilh 

 or blackifh-brou'n, with fometimes feveral of the colours 

 blended together, and often with a metallic luftre : difltrs from 

 the Fcrrum fpatofum by the fmaller proportion of iron and 

 oxydc of mangancfe i,t ?:ontams. 



04, PICROSPATUM. Confifting of carbonate of 

 lime, a nearly equal quantity of carbonate of 

 magnefia, and a very little of the oxvdes of man- 

 ganefe and iron: parafitica), hardifli: effervefr 

 cing fiowly with acids. 



amarum* PiCROSPATUM. 



Picrofpatum cryilallinum, Gmel. fyst. 'i^» app, p,\i^\^ 

 Eiiterfpath. Karsten Berg. Joum 1792. 2./, 80. 

 Muricalcite. Kir<vjan viin. i. p 92. 

 Bitterfpath. Thomfon chem, 3. /. 61 2» 



1 . In an earthy form. 



Found near Thior.'villey of an olive colour, confiding of a large 

 proportion of mild carbonate of lime, and a fnaaller of carbo- 

 nate of magnefia, but no alumina. 



2. In a ftony form, and amorphous. 



Found near Creutzen^vauU, whitifh ; contains carbonate of 

 lime 75- carbonate ot' magnefia 12. iron 13. 



3. Cryftallized. 



Found in Germany and S^^eden, greyifh-white : the crylhls are 

 in a 6-fided prifm, tranfparent or pellucid, with a rough fur- 

 facc; contains carbonate of lime 52. carbonate of magneiia 

 25. iron and manganefe 3. Klaproth, 



