M i n e r a 1 o g i a, 



PARS II. P H Y S I G A. 



Obfervationes Phyficae Mifcellae. 

 Samuel Ledel, 



De lapide Silefiaco violacei coloris; cum fcholio Lucas 

 Schroeck. 



MifcelL Acad. Nat. Curiof. Dec. 2. A. ft. 1689* p. 31, 

 lolu MattJi. Faber, 



Addenda ad Sam. Ledel obfervationem , de lapide Sile- 

 fiaco violacei coloris, 

 k Ibid. Dec. 2. A. 9. 1690. p. 459. ^ 



Martin Lister, 



An account of certain * transparent pebles, moftly of the 

 shape of the ombriae or brontiae, wherefore he called 

 - brontiae laeves, pellucidae, refplendentes, adaman- 



tum aemulae. 

 Pliilof. Transact. Y. 1693. p. 773. 



Rene Antoine Ferchault de Pxeaumur, 



Sur la rondeur que femblent affecter certaines efpeces de 

 pierres, et entr'autres fur celle qu' affectent les 

 cailloux. 



Mem. de PAc. des Sc. de Paris. A. 1 723. Hift. p. 9. Mem. 

 p. 273. Ed. Oct. A. 1723. Hift. p. 12. Mem. p. 391. 



Jofeph Platt, 



j A letter, concerning a flat fpheroidal lione having lines 

 regularly crofling it. 

 PhiloL Transact. Y. 1750. p-534- 

 Ton. II. PPP Cromwell 



