Ferriallanite-(La) (original) (raw)

A valid IMA mineral species

About Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

Formula:

(CaLa)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)

Specific Gravity:

4.208 (Calculated)

Crystal System:

Monoclinic

Name:

La-dominant analogue of ferriallanite-(Ce).

The lanthanum-dominant analogue of ferriallanite-(Ce).
Quantitative chemical analyses are needed to distinguish the species from La- and Fe-rich allanite-(Ce).

Unique IdentifiersHide

This section is currently hidden. Click the show button to view.

Long-form identifier:

mindat:1:1:39528:7

9ecb9521-d96f-4f63-b3ad-c6ce814bfd16

IMA Classification of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

IMA Formula:

CaLa(Fe3+AlFe2+)[Si2O7][SiO4]O(OH)

Classification of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

9.BG.05b

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination

58.2.1a.

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)

Mineral SymbolsHide

This section is currently hidden. Click the show button to view.

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Physical Properties of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

Fracture:

Irregular/Uneven, Conchoidal

Density:

4.208 g/cm3 (Calculated)

Optical Data of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

RI values:

_n_α = 1.791(5) _n_β = 1.827(6) _n_γ = 1.845(5)

δ = 0.054

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

X = pale brownish, Y = greyish brown, Z = dark red-brown.

Chemistry of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

Mindat Formula:

(CaLa)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)

Common Impurities:

Ce,Mg,Mn,Th,Ti

Crystallography of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.938(2) Å, b = 5.789(1) Å, c = 10.153(2) Å
β = 114.54(3)°

Ratio:

a:b:c = 1.544 : 1 : 1.754

Morphology:

The crystal is thick tabular on {100}, with additional, minor forms being small {101} or {110} and {1_k_0} or {10_l_}; very small {010} or {001}.

Twinning:

No twinning was observed.

Crystal StructureHide

This section is currently hidden. Click the show button to view.

Load
Unit Cell |Unit Cell Packed
2x2x2 |3x3x3 |4x4x4

Show
Big Balls |Small Balls |Just Balls |Spacefill
Polyhedra Off |Si Polyhedra |All Polyhedra
Remove metal-metal sticks

Display Options
Black Background |White Background
Perspective On |Perspective Off
2D |Stereo |Red-Blue |Red-Cyan

View
CIF File Best |x |y |z |a |b |c

Rotation
Stop |Start

Labels
Console Off |On |Grey |Yellow

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

This section is currently hidden. Click the show button to view.

Powder Diffraction Data:

Geological EnvironmentHide

This section is currently hidden. Click the show button to view.

Type Occurrence of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

General Appearance of Type Material:

Single, thick, tabular {100} crystal (2 mm in its longest dimension).

Place of Conservation of Type Material:

Holotype: Natural History Museum, Vienna (Austria), registered no. N8164.
Co-type (probe mount): Museum Victoria, Melbourne (Australia), registered no. M49750.

Geological Setting of Type Material:

In a void of a sanidinite xenolith.

Associated Minerals at Type Locality:

Synonyms of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

Other Language Names for Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

Relationship of Ferriallanite-(La) to other SpeciesHide

This section is currently hidden. Click the show button to view.

Other Members of this group:

Common AssociatesHide

This section is currently hidden. Click the show button to view.

Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

This section is currently hidden. Click the show button to view.

Fluorescence of Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

Other InformationHide

This section is currently hidden. Click the show button to view.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

References for Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

Reference List:

Kolitsch, Uwe, Mills, Stuart J., Miyawaki, Ritsuro, Blass, Günter (2012) Ferriallanite-(La), a new member of the epidote supergroup from the Eifel, Germany. European Journal of Mineralogy, 24 (4) 741-747 doi:10.1127/0935-1221/2012/0024-2210

Localities for Ferriallanite-(La)Hide

This section is currently hidden. Click the show button to view.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

This section is currently hidden. Click the show button to view.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.