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Tazheranite Mineral Data Guide

Tazheranite is a calcium-titanium-zirconium oxide mineral that forms yellowish orange to reddish orange anhedral crystals up to 1.5 mm in size. It has a cubic crystal structure and is brittle with a conchoidal fracture and hardness of 7.5. Tazheranite is weakly to strongly anisotropic with an index of refraction of 2.25. It occurs in calciphyres banding periclase-brucite marble xenoliths in the Tazheran alkalic massif in Russia and has been associated with spinel, forsterite and other minerals. Tazheranite was first described from its type locality in the

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108 views1 page

Tazheranite Mineral Data Guide

Tazheranite is a calcium-titanium-zirconium oxide mineral that forms yellowish orange to reddish orange anhedral crystals up to 1.5 mm in size. It has a cubic crystal structure and is brittle with a conchoidal fracture and hardness of 7.5. Tazheranite is weakly to strongly anisotropic with an index of refraction of 2.25. It occurs in calciphyres banding periclase-brucite marble xenoliths in the Tazheran alkalic massif in Russia and has been associated with spinel, forsterite and other minerals. Tazheranite was first described from its type locality in the

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Tazheranite (Zr, Ti, Ca)O2

c 2001-2005 Mineral Data Publishing, version 1

Crystal Data: Cubic. Point Group: 4/m 3 2/m, 43m, or 432. Anhedral crystals, thick
tabular, may be rounded, to 1.5 mm, and as irregular grains.

Physical Properties: Fracture: Conchoidal. Tenacity: Brittle. Hardness = 7.5


D(meas.) = 5.01(2) D(calc.) = [5.03]

Optical Properties: Semitransparent. Color: Yellowish orange to reddish orange, rarely


cherry-red, then zoned, brownish green; in thin section, pale yellow, zoned with a reddish tint.
Luster: Adamantine to greasy on fractures.
Optical Class: Isotropic; may exhibit weak to strong anisotropism, centrally zoned. n = 2.25(2)

Cell Data: Space Group: F m3m, F 43c, or F 432. a = 5.108(1) Z=4

X-ray Powder Pattern: Tazheran massif, Russia.


2.94 (10), 1.804 (10), 1.539 (10), 2.55 (6), 1.171 (5), 1.044 (5), 0.9828 (5)

Chemistry: (1)
SiO2 0.63
TiO2 2.42
ZrO2 67.67
Ti2 O3 11.65
Al2 O3 4.61
Fe2 O3 0.92
MgO 2.38
CaO 9.97
Total 100.25
(1) Tazheran massif, Russia; after deduction of spinel 5.41% and forsterite 1.48%, corresponds to
(Zr0.59 Ca0.19 Ti3+ 4+
0.18 Ti0.03 Al0.02 Fe0.02 )=1.03 O1.74 .

Occurrence: In calciphyres banding periclase-brucite marble xenoliths in an alkalic massif


(Tazheran massif, Russia).

Association: Spinel, forsterite, akermanitegehlenite, clinohumite, ludwigite, azoproite,


magnesioferrite, calzirtite, baddeleyite, geikielite, perovskite, rutile, zircon, dolomite, calcite
(Tazheran massif, Russia).

Distribution: In the Tazheran alkalic massif, west of Lake Baikal, eastern Siberia, Russia. On
Alno Island, Sweden. From the Jacupiranga carbonatite, Sao Paulo, Brazil.

Name: For the Tazheran massif, Russia, where it was first noted.

Type Material: Mining Institute, St. Petersburg, 1094/1; A.E. Fersman Mineralogical
Museum, Academy of Sciences, Moscow, Russia, 72602, vis5748; National Museum of Natural
History, Washington, D.C., USA, 145796.

References: (1) Konev, A.A., Z.F. Ushchapovskaya, A.A. Kashaev, and V.S. Lebedeva (1969)
Tazheranite, a new calcium-titanium-zirconium mineral. Doklady Acad. Nauk SSSR, 186, 917920
(in Russian). (2) (1970) Amer. Mineral., 55, 318 (abs. ref. 1). (3) Kashaev, A.A. and Z.F.
Ushchapovskaya (1969) Tazheranite a mineral with CaF2 type structure. Kristallografiya (Sov.
Phys. Crystal.), 14, 10641065 (in Russian). (4) Neder, R.B., F. Frey, and H. Schulz (1990) Defect
structure of zirconia (Zr0.85 Ca0.15 O1.85 ) at 290 and 1550 K. Acta Cryst., A46, 799809.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in
any form or by any means, electronic, mechanical, photocopying, recording, or otherwise without the prior written
permission of Mineral Data Publishing.

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