MINERALOGY. 461 



Pi/rrhoarsenite. — A new arseuiate of maug^anese described by Igelstrom, 

 and related to numerous bydrated ar^eniates of manganese, several of 

 Avliich (polyarsenite, xantboarsenite, cboudroarsenite) bave been named 

 by tbe same author. It occurs at tbo Sjo mines in tbe Grytbyttan 

 parisb, Sweden, forming small veins and masses witb tepbroite, calcite, 

 bausmauuite, barite. It sbows one cleavage, but bas not yet been found 

 in crystals. Optically it is singly refracting for tbe most part, witb oc- 

 casional anisotropic portions. Tbe bardness is 4. Tbe color is a yel- 

 lowisb red (bence tbe name from r.uf^no::, fire^ i. e., fire-red), resembling 

 l)otassiuin dicbromate. It dissolves readily in bydrocbioric and nitric 

 acids. An analysis yielded : 



AsiOstSbzOi) MnO CaO MgO Si02 AbOs, FeO 



58.06 17.96 18.68 3.58 iguitiou 0.b5 1.02, tr. =100.15 



Tbe formula given is 3(M:n, Ca, Mg)0. As2(Sb2)05. 



Schungite. — A name given (1884) by A. von Inostranzeff to a form of 

 amorpbous carbon found in tbe crystalline scbists of Scbunga, in tbe 

 Olenetzer government, Russia. It is tbe same substance tbat was 

 named grapbitoid by Sauer, as noted in tbe report for 18S5. 



Stnvenite. — A new alum occurring witb otber related minerals at 

 tbe abandoned mine of Alcaparroso, near Copiapo, Chili, described by 

 Diirapsky. It occurs in slender acicular crystals 2 or 3 incbes in leugtb. 

 An analysis yielded (mean of two): 



SO3 AI2O3 MgO NaaO K2O H2O 

 36.1 11.6 1.0 2.7 tr. 47.6 



corresponding to (Xaa, Mg')S04+Al2S30i2+24H20. Tbe name is given 

 after tbe mining engineer, Enrique Stiiven. 



BRIEF REFERENCES TO PAPERS UPON MINERAL SPECIES, 1886.* 



Agalmatolite. RossUire, Scotland, analysis, Macadam, Min. Mag., vii, 74. 



Scotland, composition discussed, Bell, Min. Mag., vii, 24. 

 ALHiiRTiTE. Scotland, occurrence, Honeymaun, Min. Mag., vii, 77. 

 Aluo'E. Kasbeii, Caucasus, crystallographic, optical, and chemical investigation, 

 Schuster, Min. petr. Mitth., vii, 373. 

 Stanislaus mine, Calaveras County, California, crystals described, A. W. Jackson, 



Proc. Cal. Acad. Sc, No. 4, p. 368. 

 Norway, optical examination, Lacroix, Bull. Soc. Min., ix, 131. 

 Litchfield, Maine, analysis, F. W. Clarke, Am. J. S'",., xxxi, 268. 

 Andreasberg, var. s'^^/atW/e examined, Kreuuer, analysis by Loczka, Zs. Kr., xi, 25'J. 

 Allactite. Laugbau, Sweden, occurrence, A. Sjogren, Geol. For. Fiirh., viii, 473. 

 Allanite. Var. orthite, containing a supposed new element, austrium, E. Linnc- 

 mann, C. R., June 21, vol. ci. 

 Devil's Head Mountain, Douglas County, Colorado, analysis, L. G. Eakins, Proo. 

 Col. Sc. Soc, II, 32. 

 Alstonite. See Bp.omlite. 



Alu.m. Occurrence and composition of Chilian varieties, Darapsky, Verb. wiss. Ver. 

 Santiago, 3, 105 e^ seg. 



* A few papers belonging to 1885, but omitted in the last report, are included here. 



