STAUROLITE SHALES FOR MULLITE-SILICA CARBIDIZED
O. A. Belogurova,
M. A. Savarina,
and T. V. Sharai
Translated from Novye Ogneupory, No. 10, pp. 7 – 12, October 2015.
Original article submitted June 11, 2015.
Staurolite shales alongside kyanite shales are extensively developed in the central part of the Kola Peninsula.
In addition, staurolite is waste during electromagnetic separation of kyanite ores, since it is classified as an un
desirable impurity (high iron content). Use of this raw material increases the value of the Keiv kyanite deposit
as a source of compound ores.
Keywords: staurolite shale, carbidized granules, water glass, lignosulfonate, mullite-silica heat-insulation
Previously we have studied heat insulation materials pre-
pared from charges based on carbidized granules of staurolite
concentrate, containing ferrosilicon production waste, alumi-
nosilicate hollow microspheres, and vermiculite 
In this work the raw material considered is staurolite
shale. Staurolite is randomly disseminated in shale, and crys-
tals “float” in a quartz muscovite substrate with an admixture
of plagioclase, kyanite and goethite (Fig. 1).
A feature of staurolite is zonality, exceptionally clearly
developed in the majority of crystals. The main elements of
zonality are a nucleus and two first order zones. Within them
fine second order zonality is developed. A nucleus consists
of uniformly disseminated staurolite microcrystals in a
cryptocrystalline mixture of quartz with admixtures of rutile,
ilmenite, and graphite. Microcrystals are binary packages of
rhombic or pseudo-hexagonal staurolite platelets, sometimes
with quartz interlayers. The sizes of platelets are constant in
all nuclei and are on average 0.25 mm. Some crystals, con
nected with cracks, grow in the form of nodules.
The average mineral composition of staurolite shale, %:
quartz 41, muscovite 9, plagioclase 28, staurolite 18, kyanite
3, rutile 2, and ilmenite 2. A small amount of biotite, chlorite,
pyrrhotite, pyrite, chalcopyrite, pentlandite, molybdenite,
graphite, orthite, zircon, apatite, and epidote may be present.
Staurolite shale chemical composition, wt.%: %: SiO
1.84, FeO 1.84, MgO
0.56, CaO 0.78, Na
O 2.13, K
O 1.8, H
O 2.21, (MnO, S,
, Ni, Cu, Co, Zn, Pb, P
)<0.n. Staurolite chemical
composition, determined by means of x-ray spectral micro
analysis, wt.%: SiO
27.69 – 28.71, Al
52.73 – 53.65,
FeO 12.76 – 13.31, MgO 2.04 – 2.26, ZnO 0.07 – 0.13, MnO
0.09 – 0.13, total 96.58 – 97.25 .
In performing this work the quartz-muscovite-plagio
clase component, differing in color from the green of stauro
lite, was partly removed.
Refractories and Industrial Ceramics Vol. 56, No. 5, January, 2016
1083-4877/16/05605-0447 © 2016 Springer Science+Business Media New York
FGBUN I. V. Tananaev Institute of Chemistry and Rare Element
Technology and Mineral Raw Material, Russian Academy of Sci
ences, Kola Peninsula Scientific Center, Apatity, Russia.
Fig. 1. Staurolite crystals St in a substrate of quartz Qz and musco
vite Ms with admixture of plagioclase Pl, kyanite Ky, and goethite