Tilasite (original) (raw)

A valid IMA mineral species - grandfathered

About TilasiteHide

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Colour:

Light gray, violet-gray, pinkish red (Långban); olive-green, apple-green (India); colourless or pale green in transmitted light.

Lustre:

Vitreous, Resinous

Crystal System:

Monoclinic

Name:

Named in 1895 by Stens Anders Hjalmar Sjögren in honour of Daniel Tilas (2 March 1712, Gammelbo, Ramsbergs parish, Västmanland, Sweden - 27 October 1772, Stockholm, Sweden), polymath, geologist, mining engineer, vicar of Hammar, director of mines, and regional governor. He was the vice-commissioner of the Sweden-Norway Boundary Commission. In 1742, Tilas anticipated aspects of later glacial theories by suggesting that drifting sea ice could be responsible for the distribution of erratic boulders on land. Tilas' grandfather was Urban Hjärne who was a physician and noted chemist and who was also director of the Swedish Chemical Laboratory, president of the Collegium Medicum (medical college), and president of the Board of Mines.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3962:4

IMA Classification of TilasiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of TilasiteHide

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8.BB.

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1

41.5.6.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq

22.1.29

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride

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 TilasiteHide

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Comment:

vitreous on cleavages

Colour:

Light gray, violet-gray, pinkish red (Långban); olive-green, apple-green (India); colourless or pale green in transmitted light.

Cleavage:

Distinct/Good

On {101}, good.

Parting:

On {133}, {102}, and on {011}

Density:

3.77(2) g/cm3 (Measured) 3.80 g/cm3 (Calculated)

Optical Data of TilasiteHide

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RI values:

_n_α = 1.640 _n_β = 1.660 _n_γ = 1.675

δ = 0.035

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

Optical Extinction:

Z = b; X ∧ c ≃ 30°.

Chemistry of TilasiteHide

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Mindat Formula:

CaMg(AsO4)F

Crystallography of TilasiteHide

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Crystal System:

Monoclinic

Cell Parameters:

a = 6.691(10) Å, b = 8.947(3) Å, c = 7.563(10) Å
β = 121°

Ratio:

a:b:c = 0.748 : 1 : 0.845

Unit Cell V:

388.09 ų (Calculated from Unit Cell)

Morphology:

Crystals equant, may be elongated along [100], flattened on {010}, with complex domatic form development, to 3.5 cm; in subparallel groups, granular, in veinlets, massive.

Twinning:

On {001}, common as symmetrical contact twins.

Comment:

Point Group: 2/m or m; Space Group: C2/c or Cc.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0000298	Tilasite	Bladh K W, Corbett R K, McLean W J, Laughon R B (1972) The crystal structure of tilasite American Mineralogist 57 1880-1884		1972	0	293
0014869	Tilasite	Bermanec V (1994) Centro-symmetric tilasite from Nezilovo, Macedonia: a crystal structure refinement Neues Jahrbuch fur Mineralogie, Monatshefte 1994 289-294	1994	Nezilovo, Macedonia	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα

Data Set:

Data courtesy of RRUFF project at University of Arizona, used with permission.

Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of TilasiteHide

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General Appearance of Type Material:

Grains or veinlets in dolomitic limestone bearing hausmannite.

Synonyms of TilasiteHide

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Other Language Names for TilasiteHide

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Relationship of Tilasite to other SpeciesHide

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Other Members of Tilasite Group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of TilasiteHide

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May fluoresce pale yellow (ex. Sterling Hill), pale pinkish orange (ex. Sterling Hill), orange (ex. Långban), or dark red (ex. Långban) under SW UV. Also yellow-orange under LW UV (ex. Sterling Mine).

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 TilasiteHide

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References for TilasiteHide

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Reference List:

Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.

Pekov, Igor V., Koshlyakova, Natalia N., Zubkova, Natalia V., Lykova, Inna S., Britvin, Sergey N., Yapaskurt, Vasiliy O., Agakhanov, Atali A., Shchipalkina, Nadezhda V., Turchkova, Anna G., Sidorov, Evgeny G. (2018) Fumarolic arsenates − a special type of arsenic mineralization. European Journal of Mineralogy, 30 (2) 305-322 doi:10.1127/ejm/2018/0030-2718

Koshlyakova, N.N., Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Turchkova, A.G., Kartashov, P.M., Sidorov, E.G., Pushcharovsky, D.Yu. (2020): A new solid solution with the garnet structure: the berzeliite–schaferite isomorphous series from Fumarole exhalations of the Tolbachik volcano, Kamchatka. Zapiski RMO (Proceedings of the Russian Mineralogical Society): 149(1): 69-84.

Localities for TilasiteHide

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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.