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Borickyite

Formula:
(Ca,Mg)(Fe
3+
 
,Al)
 
4
[(OH)
 
8
|(PO
 
4
,SO
 
4
,CO
 
3
)
 
2
] · 3-7.5H
 
2
O
System:AmorphousColour:Reddish brown
Name:For E. Boricky (1840-1881), Czech petrographer, who described a similar compound in 1867.


A questionable mineral, probably identical with Delvauxite, equally doubtful.
Originally reported from Brandberg Mt., Leoben, Styria, Austria.

Classification of Borickyite

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Physical Properties of Borickyite

Lustre:Waxy
Diaphaneity (Transparency):Opaque
Comment:Lustre weakly waxy.
Colour:Reddish brown
Streak:Reddish brown

Crystallography of Borickyite

Crystal System:Amorphous
Morphology:Compact reniform masses.

Optical Data of Borickyite

Type:Isotropic
RI values: n = 1.57 - 1.67
Maximum Birefringence:δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:Moderate

Chemical Properties of Borickyite

Formula:
(Ca,Mg)(Fe
3+
 
,Al)
 
4
[(OH)
 
8
|(PO
 
4
,SO
 
4
,CO
 
3
)
 
2
] · 3-7.5H
 
2
O
All elements listed in formula:Al, C, Ca, Fe, H, Mg, O, P, S

Other Names for Borickyite

Synonyms:
BorickiteBorickytBoryckite
Other Languages:
German:Borickit
Borickyit
Boryckit

Other Information

Other Information:Soluble in HCl.
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 Borickyite

Reference List:Bořicky (1867) Nat. Zs. Lotos (March, 1867).

Dana, J.D. (1868) System of Mineralogy, 5th. Edition, New York: 588 (as Borickite).

Vála and Helmhacker (1874) Arch. Naturw. Landes. Böhmen: 2: 381.

Vála and Helmhacker (1875) Jb. Min.: 317.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 49.

Hintze, C. (1933) "Handbuch der Mineralogie", Vol. 1, part 4.

Meixner, H. (1950): Der Karinthin 11: 242-252.

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.: 915.

Cech, F., P. Povondra (1979) "A Re-examination of Borickyite." Tschermaks Mineralogische und Petrographische Mitteilungen 26: 79-86.

Internet Links for Borickyite

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    Localities for Borickyite

    (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.
    Austria
     
    • Styria
      • Leoben
    		H. Meixner: Der Karinthin 11:242-252 (1950)
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Pardubice Region
    		Prachař, I.: Současný stav výskytu nerostů ve Chvaleticích. Acta musei Reginaehradecensis, série A: vědy přírodní, 1981, roč. XVI., s. 99-102.
    Mineral and/or Locality
    Google
     
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