DEc., 1908. MINERALOGICAL NOTES 143 
the size of the crystal, measurements were for the most part made 
by contact rather than by reflection. 
The following is a list of forms and angles found, the new form 
being marked by an asterisk: 
é (o1l2)+4R t (2134)+4R 3 f(4156)+4 R8 
} (0221)+2R v (2131)+R 3 tpi 4019.93) + e Rese. 
M (4041) +4R . 
Observed Calculated 
mieawecon\ ¢.- = .(1olr), A ; (ora) ey ik ied ytahs (ies 
memes =. (orl2) A, (0221) aay Oe 80, 52. 
BaaA, M. =~ (o1rl2) A (0441) See Ose yes 
fee te ==.) (oF12) A) (2434) lee nee 30g a" 
Meee ==. fOT12) A’ i (2731) =, 67" 66° 24’ 
moe ee (AT50) A. (5146) =e a Ea Apel 
EAM = (4156) A (4041) Seen e3O 6390-44! 
fe =< (Tor2) A 2 '(4156) = 11S” PU ies Oe 
Pemmeeny  o(404t) A. (er, 4:15, 3) = 15° ite le 
Cee =) (Ole) Aw (rr. 4:15:93) = 977° he lens 
a). = (2134) A ADE, 4. IS. HI? Dae Chetty 6 alias Shen 3 
Pep. (11. Ayo. 3) A (as. 4. 11. 3) =.) 30° eOcumess 
A number of groups of calcite crystals from the Joplin District, 
exhibited by a private collector, Mr. John C. Moore, at the Louisiana 
Purchase Exposi- 
tion, were of espe- 
cial interest on 
account of thelarge 
size of the crystals 
and the perfection 
of their planes. A 
number of these 
were obtained by 
the Museum (Mus. 
Nos. M 7874-7884). 
Examination of 
the crystals with 
the contact goni- 
ometer shows them 
to be made up of 
common forms, 
such as are already 
Fic. 2. Calcite. known to charac- 

