Brianyoungite

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Brianyoungite
Brianyoungite-122711.jpg
Brianyoungite from Germany
General
Category carbonate
Formula
(repeating unit)
Zn3(CO3)(OH)4[1]
Strunz classification 5/C.01-105 or 5.BF.30
Dana classification 17.1.15
Identification
Formula mass 333.22 g[2]
Color White
Crystal habit Rosettes of thin blades [3]
Crystal system Orthorhombic or monoclinic with β close to 90o
Cleavage Perfect on {100}, possible on {001}[3][4]
Mohs scale hardness Probably 2 to 2½
Luster Vitreous
Streak White
Diaphaneity Transparent to translucent
Specific gravity 3.93 to 4.09
Optical properties Biaxial
Refractive index nω = 1.635, nε = 1.650
Birefringence δ = 1.635[5]
Solubility Readily soluble with effervescence in acids[3]
Other characteristics Non-fluorescent[3]
References [1][2][3][4][5][6]

Brianyoungite is a secondary zinc mineral. the Commission on New Minerals, Nomenclature and Classification (CNMNC) of the International Mineralogical Association (IMA) classifies it as a carbonate with the formula Zn3(CO3)(OH)4,[1] but sulphate groups SO4 also occupy the carbonate CO3 positions, in the ratio of about one sulphate to three carbonates,[3] so other sources give the formula as Zn3(CO3,SO4)(OH)4, and Gaines et al. classify the mineral as a compound carbonate.[6] It is similar in appearance to hydrozincite, another zinc carbonate.[5] It was discovered in 1991 and designated IMA1991-053.[5] In 1993 it was named "brianyoungite" after Brian Young (b 1947), a field geologist with the British Geological Survey, who provided the first specimens.[4][6]

Appearance[edit]

Brianyoungite (white) with fluorite and sphalerite from the Brownley Hill Mine, Cumbria, England.

The mineral occurs as tiny rosettes less than 100 µm across, composed of thin blades just one or two micrometers across, elongated parallel to the b crystal axis, and tapering to a sharp point.[3] The crystals are white and transparent to translucent, with a vitreous lustre and a white streak.

Structure[edit]

The mineral belongs in the orthorhombic crystal system, or the monoclinic with β (the angle between the a and c crystal axes) close to 90o.[3] The space group is unknown, but assumed to be either P21/m, P21 or P2221.[4][5] The structure is similar to that of hydrozincite.[6] There are four formula units per unit cell (Z = 4) and the lengths of the sides of the unit cell are a = 15.724 Å, b = 6.256 Å and c = 5.427 Å.[3]

Physical properties[edit]

Brianyoungite is a soft mineral with Mohs hardness similar to halite, only 2 to 2½ according to some sources,[2][5] but others say that the hardness is not determinable.[3][4] It is fairly dense, with specific gravity 3.93 to 4.09, similar to that of celestine. Cleavage is perfect perpendicular to the a crystal axis (perfect on {100}) and possible perpendicular to the c crystal axis (possible on {001}).[3][4] It is readily soluble with effervescence in acids.[3]

Optical properties[edit]

The mineral is biaxial, with refractive indices nω = 1.635 and nε = 1.650 and maximum birefringence δ = 1.635.[5] It exhibits straight extinction.[3] It is not fluorescent.[3]

Occurrence[edit]

The type locality is the Bloomsberry Horse level of the Brownley Hill mine, Nenthead, Alston Moor District, North Pennines, North and Western Region (Cumberland), Cumbria, England.[5] The type material is conserved at the Royal Museum of Scotland, Edinburgh, Scotland, 1992.17.1–8.[4]
Brianyoungite occurs with gypsum on rubbly limestone in the oxidised zone of Brownley Hill Mine, and on specimens from the nearby Smallcleugh mine.[3] It may be a secondary post-mining mineral.[2][4] At the type locality it is associated with gypsum, smithsonite, pyrite and goethite.[4]

References[edit]

  1. ^ a b c "IMA Mineral List with Database of Mineral Properties". 
  2. ^ a b c d "Brianyoungite Mineral Data". Webmineral.com. Retrieved 2013-11-15. 
  3. ^ a b c d e f g h i j k l m n o Livingstone, A.; Champness, P.E. (1993). "Brianyoungite, a New Mineral Related to Hydrozincite, from the North of England Orefield". Mineralogical Magazine 57 (389): 665–670. doi:10.1180/minmag.1993.057.389.10. ISSN 0026-461X. 
  4. ^ a b c d e f g h i "Handbook of Mineralogy". Handbook of Mineralogy. Retrieved 2013-11-15. 
  5. ^ a b c d e f g h "Brianyoungite: Brianyoungite mineral information and data". Mindat.org. Retrieved 2013-11-15. 
  6. ^ a b c d Gaines et al (1997) Dana’s New Mineralogy Eighth Edition. Wiley