Garyansellite (original) (raw)

A valid IMA mineral species

About GaryanselliteHide

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Formula:

(Mg,Fe)3(PO4)2(OH,O) · 1.5H2O

Crystal System:

Orthorhombic

Name:

Named in 1984 by Bozidar Darko Sturman and Pete J. Dunn in honor of Harold Gary Ansell (1943 - ), mineralogist with the Canadian Geological Survey. He was curator of the National Mineral Collection from 1972-1997.

Forms a series with kryzhanovskite. Structurally close to other members of the phosphoferrite–reddingite series (or phosphoferrite group).

Small (<1 mm) nearly colorless, zones, fringes, or patches in olive phosphosiderite.

The structure is layered, with layers comprising chains formed by edge-sharing M(2)O4(OH)(H2O) octahedra; these octahedra form dimers and these share edges with separate M(1)O4(H2O)2 octahedra. The chains are linked to layers through the common vertices of M(2); octahedra and octaahedral layers are connected via the phosphate tetrahedra.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1655:7

c178c62a-c2fb-4da0-934b-2b9e68a31c53

IMA Classification of GaryanselliteHide

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IMA Formula:

Mg2Fe3+(PO4)2(OH) · 2H2O

Classification of GaryanselliteHide

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8.CC.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
C : With only medium-sized cations, RO4:H2O = 1:1.5

40.3.2.5

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O

19.14.12

19 : Phosphates
14 : Phosphates of Fe and other metals

Mineral SymbolsHide

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

Physical Properties of GaryanselliteHide

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Comment:

"bronze on cleavages"

Cleavage:

Distinct/Good
{001}

Density:

3.16(4) g/cm3 (Measured) 3.154 g/cm3 (Calculated)

Optical Data of GaryanselliteHide

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RI values:

_n_α = 1.733 _n_β = 1.757 _n_γ = 1.761

2V:

Measured: 55° , Calculated: 42°

δ = 0.028

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

Comments:

reddish brown (X=Z), yellow (Y)

Comments:

Orientation: X = b, Y = a, Z = c; absorption: Z = X > Y

Chemistry of GaryanselliteHide

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Mindat Formula:

(Mg,Fe)3(PO4)2(OH,O) · 1.5H2O

Crystallography of GaryanselliteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 9.45 Å, b = 9.89 Å, c = 8.19 Å

Ratio:

a:b:c = 0.956 : 1 : 0.828

Unit Cell V:

765.44 ų (Calculated from Unit Cell)

Comment:

Space group is Pbna; parameters from Zubkova et al. (2016): a=9.44738, b=9.85976, c=8.14154, V=758.38

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Rapid Creek, Yukon, Canada. Data from the type description.

Geological EnvironmentHide

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Type Occurrence of GaryanselliteHide

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General Appearance of Type Material:

Place of Conservation of Type Material:

Royal Ontario Museum, Toronto, Canada (registration no. M37306)

Geological Setting of Type Material:

fractures in a sedimentary iron formation; rare, low-temperature species

Associated Minerals at Type Locality:

Synonyms of GaryanselliteHide

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Other Language Names for GaryanselliteHide

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Relationship of Garyansellite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 GaryanselliteHide

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References for GaryanselliteHide

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Reference List:

Zubkova, N. V., Pekov, I. V., Kasatkin, A. V., Chukanov, N. V., Ksenofontov, D. A., Pushcharovsky, D. Yu. (2016) Crystal structure and refined formula of garyansellite Mg2Fe3+(PO4)2(OH) · 2H2O. Doklady Earth Sciences, 467 (1) 299-302 doi:10.1134/s1028334x16030235

Localities for GaryanselliteHide

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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

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- 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.