NO. 1628. ON METEORIC CHROMITES—TASSIN. 
e 689 
_drules embedded in a fragmental groundmass or matrix, the materials 
for which were derived from the trituration of other chondrules.” 
Of the ten chromites here analyzed, one only approximates the 
typical compound FeO. Cr,O,. Eight contain alumina and magnesia. 
Two contain ferric oxide and are free from alumina and magnesia. 
One is so rich in ferric oxide that it may be regarded as a chromifer- 
ous magnetite. Two of these chromites, from different parts of the 
same fall, have widely differing compositions. 
Tabulating, for comparison, these analyses with such others as were 
available, thus: 
Chemical composition of various meteorites. 
Name. Cr203 AleOs. Fe2Os. FeO. MgO. | SiOz. | TiOe 
YANCO hited hey sere oseee sea gt ea a (G5 322 NG J See a a pee 33.00 0.40 0.50 | at fete Sew 
Mounts Wernnon 4. 65.01 OHS ane 18.97 FHOOG |dere saan Poste i Dae 
ID XO See eee De pet a cate nti Re 64.91 D8 bid eee hae oes 17.97 4.96 1.38 locercerscme 
Canyon Diablo_______._______ i 63.40 ESSER 00h ae Reto eu 26.30 Fa Cm peek RC a aaa 
Coahwil aie ee ee Ie (GVA Deel Baya aerate At Be eee SOS pt | eesaeteee eee nee cats or aay ear ae 
[BULA OXON Oe | 62200 Ses See ASTOR (HO) | Been ariel | ect eemant Ae Eee eS ee RE 
Maralain tines.) Sse se ene 61.39 AGG Rec Ra ess 30.46 Gy Or rset ACE Sa Aone 
Klein-Wenden ¢__-__-_--______ | HOM BD Ne ei se Se Bika c | ie ela 27.93 AAG ee Sia areal th oem an 
Sih ail ake ss ee ee eee | 56.82 LESS Ges |e erreat 5 26.14 EE OSs | eee eee me ela eee 
Hendersonville________________ 56.73 D2 ORM) teow Ee | 29.64 DAD Sphere eae NSS |S ekg eke See, 
leo ome ae ee bi ee bet 56.70 OP BS Eetou choot tisk 27.60) AS (\() a Me och ee Trace 
Admire__-______- eer sae ae Sta EN 56.49 Trace. | 10.20 29.92 UPN 24 Geis | eter aes ee eee 
TTEDAGS lke aaa eR aye DET? 52.13 O08 ee UL G2) asceceala dedieal Ua, vee ora aU ee a 
PAULL rer Tay, fee te eee a 50.31 EG (gap eene wees | 28.71 Del Own) Bene west a 1.20 
SewLukotigss 22 se see 39.40: 2885 0M eee oe | 31.50! (DE Gia | Seen as es oe Ses 
WOMAN eee seme wee eo See oa GOs, kee ata | AES 0s eee 2OLO0g | Mines a ak Rea 
CanyoneDiablos aes | S530) | pene ea | 65.25 SON OD ate seers tits | ease panos Sat (BE eee ce ee 
CATO, AOwWE, SC, (SB), BOs, AiSly 75° kor, 
®’ Bul. Comm. Geol. De Finlande, 1902, No. 12, p. 13. 
. Konig. preuss. Akad. Berlin, 1844, p. 245. 
¢Ann. k. k. Nat-hist. Hofmus., III, 1888, p. 199. 
e Sitzber. k. bayrischen Akad. Munchen, VIII, 1878, pp. 39-40. 
f Proc. Wash. Acad. Sci., II, 1900, p. 48. 
9 Arch, f. d. Natur. Lib. Ehst. Kurl., TX, 1882, p. 137. 
% Abh. k. Akad. Wissen, Berlin, 1870, p. 93. 
In the above table the chromic oxide has a maximum percentage of 
65.49 and a minimum of 5.20. Disregarding this last which may be 
regarded as a chromiferous magnetite, the next lowest is 24.60. Fer- 
rous oxide ranges from a maximum of 37.68 to a minimum of 17.79. 
Arranging the values found for ferrous and chromic oxides in the 
order of their ferrous oxide contents and placing below this value the 
chromic oxide found, thus: 
37.68 33.83 33.00 31.50 30.46 26.30 26.14 18.97 17.97 
52.13 62.71 65.49 39.40 61.39 63.40 56.82 65.01 64.91 
It becomes apparent that there is no exact relation existing between 
the proportions of the two oxides. A low ferrous oxide content does 
not necessarily imply a high chromic oxide value. 
The percentages of alumina are: 28.50, 12.38, 11.36, 10.25, 9.95, 9.85, 
9.67, 5.30, 2.98, and 1.96. Eight of the ten chromites carrying alumina 
have more than 5 per cent of this oxide; one has 28.5 and but two 
