Description of a New Mineral called Haytorite. 297 



1802 : its mean distance from the sun is 2.772886 ; that of the 

 earth being considered as unity. 



It performs its sidereal revolutions in 1686.5388 mean solar 

 days ; and its mean synodical revolution in 466.22 days. 



Its mean longitude, at mean noon, at Greenwich, on January 

 1, 1820, was in 108° 24' 57",9. 



Its mean motion in its orbit, in a mean solar day, is 1 2' 48", 

 3934 : its mean motion in 365 days is consequently 77° 54' 

 25",59- 



The longitude of its perihelion on January 1, 1820, was in 

 121° 7' 4",3. 



Its orbit is inclined to the plane of th6 ecliptic in an angle 

 of 34* 34' 55". 



Its ascending node was, on January 1, 1820, in 172° 39' 

 26",8. 



The eccentricity of its orbit is 0.241648 ; half the major axis 

 being considered as unity. 



The greatest equation of the centre is 27° 49' 19". 



This planet appears to be subject to very considerable per- 

 turbations. 



Akt. XXIX. — Description of the New Mineral called Hay- 

 torite, drawn up from the Observations of Mr Tripe, Mr 

 Cole, Mr Phillips, and Mr Levy.* 



This very remarkable mineral, which has already called forth 

 the ingenuity of some of our ablest mineralogists, was first de- 

 scribed by Cornelius Tripe, Esq. who transmitted crystals of 

 it to William Phillips, Esq. for measurement. 



" It was found,"" says Mr Tripe, " in detached pieces, ac- 

 companied by small masses of chalcedony, garnet, actynolite, 

 talc, and very splendent octohedral oxidulated iron. These sub- 

 stances altogether formed a single bunch of considerable size, 

 enveloped by a ferruginous clay in a large lode of very pure 

 oxidulated iron, in an iron mine adjacent to the Hay Tor gra- 

 nite quarries, Devonshire. 



* The observations of these gentlemen form three successive articles in 

 the Philosophical Magazine, No i. p. 38, Jan. 1827. 



