Minerals - Aeschynite-(Y)

Aeschynite-(Y)Y(TiNb)O₆

Chemical Properties

Mineral Class

Oxides and Hydrxides

Toxicity

none

Formula

Y(TiNb)O₆

Unit Cell

a=7.45 b=11.00 c=5.18 Z=4

Physical Properties

Hardness

5 - 6

Streak

whiteredyellowyellow red

Optical Properties

Color

blackbrownorangeyellowbrown black

Birefringence

0.220

Luster

Pearly,

Resinous,

Waxy

Transparency

translucent,

opaque

Pleochroism

Geomineralogical Properties

Crystal System

Composition

Elements

Mass

Nb₂O₅

17.99

Ta₂O₅

0.89

SiO₂

0.38

TiO₂

32.91

SnO₂

0.12

ThO₂

7.69

ZrO₂

<0.01

Karten-Ebenen

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. Discovered in Norway in 1906.

Chemistry :

Synonyms : Blomstrandine, Blomstrandinite, Priorite, Taiyite

Varieties :

literature

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

Density

Heavy (3,5-6)

Cleavage

Perfect after (100), (010) and (001)

Fracture

uneven

Tenacity

Brittle

orthorhombic

Point Group

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

Space Group

Pmna (53)

Habit

blocky, prismatic, prismatic, 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

Rather rare

Synonyms

Aeschynit-(Y), Aeschynit, Aeschynit-Y, Yttrium-Aeschynit

UO₂

4.01

Al₂O₃

<0.01

(Y,Er)₂O₃

28.76

Ce₂O₃

1.97

FeO

1.48

MnO

0.27

PbO

0.06

MgO

0.04

CaO

1.02

Na₂O

0.22

K₂O

0.19

H₂O

1.88

Norway (Palache et al. 1952)

Groups and Members

Aeschynite-Group

Mineral - Aeschynite-(Y)

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