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Coeruleolactite

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Turquoise Mine, Cripple Creek, Cripple Creek District, Teller Co., Colorado, USA
© 2002 John H. Betts

Show Coeruleolactite Photos (6)
System:TriclinicColour:Milk-white, light blue
Hardness:5
Name:From the Greek "coeruleus" for "blue" and "lactis" for "milk" in allusion to its typical colour.


A discredited member of the Turquoise Group.

Originally described from Rindsberg Mine, Katzenelnbogen, Taunus Mts, Rhineland-Palatinate, Germany.

Classification of Coeruleolactite

IMA status:Discredited 2006
Dana 8th edition ID:42.9.3.2

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
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Occurrences of Coeruleolactite

Geological Setting:Oxidized zones of iron deposits; pegmatite.

Physical Properties of Coeruleolactite

Lustre:Vitreous, Waxy
Diaphaneity (Transparency):Translucent
Colour:Milk-white, light blue
Streak:White
Hardness (Mohs):5
Fracture:Irregular/Uneven, Conchoidal
Density (measured):2.55 - 2.7 g/cm3

Crystallography of Coeruleolactite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 7.529Å, b = 9.951Å, c = 7.782Å
α = 112.51°, β = 116.54°, γ = 68.57°
Ratio:a:b:c = 0.757 : 1 : 0.782
Unit Cell Volume:V 468.35 ų (Calculated from Unit Cell)
Z:1
Morphology:Microcrystalline to cryptocrystalline; fibrous veinlets, botryoidal aggregates, and crusts.

Optical Data of Coeruleolactite

Type:Uniaxial (+)
RI values: nω = 1.580 nε = 1.588
Maximum Birefringence:δ = 0.008

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Relationship of Coeruleolactite to other Species

Common Associates:
WavelliteVarisciteLimoniteGoethiteGibbsite
Cacoxenite

Other Names for Coeruleolactite

Other Languages:
German:Cœruleolactin
Coeruleolactit
Spanish:Coeruleolactita

Other Information

Other Information:Soluble in acids and in alkalies.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Coeruleolactite

Reference List:Petersen (1871) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: 353 (as Cœruleolactin).

Genth (1875) Min. Report Pennsylvania: 143.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 59.

Hintze, C. (1933) Hadbuch der Mineralogie. Gruyter & Co., Berlin: 1(4.2): 927 (in German).

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 961.

Beiträge zur Mineralogie und Petrographie 6 (1958), 182 [Powder Pat., Chemistry].

American Mineralogist (1958): 43: 1224 [Abstract].

Foord, E.E. & Taggart, J.E. (1998): A reexamination of the turquoise group; the mineral aheylite, planerite (redefined), turquoise and coeruleolactite. Mineralogical Magazine, 62, 93-111.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680pp.: 123.

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    Localities for Coeruleolactite

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    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Bolivia
     
    • Oruro Department
      • Dalence Province
        • Huanuni
    		SEM analyses by Gene Foord, U.S. Geological Survey, done as part of an unpublished study of the turquoise group (analyses copies courtesy of Brian Kosnar)
    Brazil
     
    • Southeast Region
      • Minas Gerais
        • Doce valley
          • São José da Safira
    		Cassedanne, J.P & J.O. (1980): Famous mineral localities: The Cruzeiro mine, past and present. Mineralogical Record 11: 363-367 +370
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