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XXIV. Account of a mineral Substance , called Strontionite, in 
which are exhibited its external , physical , and chemical Cha- 
racters. By Mr. John Godfrey Schmeisser, F. R. S. 
Read May 29, 1794. 
This substance has obtained its name from the place Stron- 
tion, in Scotland, where it is found in granite rocks, accompa- 
nied by galena and witherite, which latter is described by Dr. 
Withering in the Philosophical Transactions of the year 1 784. 
On all the specimens which I have seen of this substance, I 
could not discover any regular crystallized shape, like the 
witherite. 
The specimen which I submitted to experiments, was in 
solid masses of a fibrous texture, apparently composed of long 
fibres, closely adhering to each other, and disposed in a radiated 
manner; its colour was an asparagus green, which appeared 
deeper towards the centre of the mass ; when broken, the sur- 
face was a little shining in certain directions, the fragments 
rather bar-like, and somewhat brittle. 
Some specimens exhibit only light shades of this colour, 
and appear to be composed of long thin bars, which are often 
separated from each other towards the extremity. 
The specimen which I examined, and used for experiments, 
was semitransparent, but the most part of it rather inclining 
to opaque. 
