246 Mineralogical Notices. 
Whence for the protoxyds, peroxyds, silica - water, 4:02: 8°37: 
24:15: 8-04=1: 2:6: 2, giving the form 
3(Na, Ca) Si+- Zr? to 
The earth called zirconia was proved to be identical with the 
zirconia of the Fredericksvarn zircon. Whether it may not be 
the allied earth Noria, it is at present difficult to determine. 
This mineral is associated with the Tritomite. 
3. Arueriastite, (Weibye and Berlin, ibid. )—Dimetrie. 
square or eight sided prisms terminating in a pyramid having the 
¢ mieriy angle 135°. Cleavage lateral, perfect, actani even and 
; mooth, but not shining. Color verdigris-green, commonly some- 
‘what dirty ; streak greenish-gray. Opaque. Fracture uneven 
and splintery. B.B. in the forceps intumesces, and fuses easily to 
a dull brown glass. In fine powder noe decomposed in mu- 
es rlatic acid. Composition according to 
aes Si Al Oa Mg Mn 
a, -88:00 2410 2264 280 482 O78 695 
Em “Oxygen, 1973 1125 647 110 107 O17 622 
yw he gives for the oxygen of the protoxyds, peroxyds, silica and 
eA € water, 8°81: 11 ‘25 : 19-73 : 6°22, whence the author deduces the 
~~ > From an iron mine near Arendal, in granite with black garnet 
; “/* and Keilhauite. It had been taken for scapolite. [Is it not still 
- ‘qpossible that the mineral may be an altered scapolite ? The an- 
4 Fe the pyramid of scapolite is 136°, which is very neat that 
ba given for the Atheriastite. | 
e/: a4. Evpyoruire, (Weibye, von Borck, and Berlin, 
. yt” - ibid.)—Trimetric. Crystals rhombic prisms of about 
1 30°*. Cleavage, basal perfect ; diag- 
Cleavage face somewhat pearly. 
», “Also. granular massive, and sometimes having a 
B.B. fuses to a clear ania glass. Pul- 
pries formsa jelly with muriatic acid. ‘Compan 
tee 04 to von Borck and Berlin:— 
Cr ee eee Wn 
25° 59 - hy 108 ss iss 8:29=100°87 .. 
OB19. 3 ow 8'16=100°41 
tformula of analcime, Na® Siem Seer, and 
\étéfore dimorphous. F'ound with ae 
ath a Norway, in Line 
