Minerals - Aeschynite-(Ce)

Aeschynite-(Ce)Ce(TiNb)O₆

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

radioactive

Formula

Ce(TiNb)O₆

Unit Cell

a=7.54 b=10.96 c=5.40 Z=4

Physical Properties

Hardness

5 - 6

Streak

brown

Density

Optical Properties

Color

blackbrown

Birefringence

Luster

Metallic,

Pearly,

Resinous,

Waxy

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

orthorhombic

Composition

Elements

Mass

Nb₂O₅

29.64

TiO₂

21.81

SnO₂

0.18

ThO₂

15.75

(Y,Er)₂O₃

1.12

(La,Dy)₂O₃

5.60

Ce₂O₃

18.49

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Geologische KarteSatelliten Karte

Name and first discovery : Named after the Greek word "aeschyne" for "shame," due to chemists' failed attempts to separate the titanium from the zirconium in aeschynite (Ce). Discovered in Russia in 1830.

Chemistry :

Synonyms : Eschynite

Varieties : Alumolyndochite, Calciolyndochite

Abbreviation : Aes-Ce

literature

Palache, C., Berman, H., & Frondel, C. (1952). Dana's system of mineralogy. Geologiska Föreningen i Stockholm Förhandlingar , 74 (2), 218-219.

Cleavage

Indistinct after (100)

Fracture

conchoidal

Tenacity

Brittle

Point Group

orthorhombic-dipyramidal - 2/m 2/m 2/m

Space Group

Pmna (53)

Habit

coarse, massive, prismatic, columnar, tabular

Formation

As a primary accessory mineral, formed by crystallization from highly differentiated magmatic residual melts enriched in incompatible elements or hydrothermal fluids, occurring predominantly in granitic pegmatites (NYF-type) as well as in alkaline igneous rocks (e.g. nepheline syenites) and carbonatites

Paragenesis

Twinning

Rarity

Rarely

Synonyms

Aeschynite-(Ce), Aeschynite, Aeschynite-Ce, Cerium-Aeschynite

FeO

3.17

CaO

2.75

LOI

1.07

Russia (Palache et al. 1952)

Groups and Members

Aeschynite-Group

Mineral - Aeschynite-(Ce)

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