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Hydroxylherderite

Big Photo

Araçuaí, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
© Rob Lavinsky

Show Hydroxylherderite Photos (122)
Formula:
CaBe[(OH,F)|PO
 
4
]
System:MonoclinicColour:Colorless, gray, brown, ...
Hardness:5 - 5½
Name:For Siegmund August Wolfgang von Herder (1776-1838), Mining official in Freiberg, Germany, and the "Hydroxyl-" prefix for the dominance of hydroxyl ions over Fluorine.


Herderite-Hydroxylherderite Series. The hydroxyl-dominant analogue of Herderite. Hydroxylherderite is isotypic with Datolite.

Found usually as a pegmatite mineral formed during late stage hydrothermal deposition.

Warning: Most specimens labelled "herderite" are in fact hydroxylherderite, i.e., OH-dominant members of the solid-solution series.

Classification of Hydroxylherderite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/B.01-20
Nickel-Strunz 10th (pending) edition ID:8.BA.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
A : With small and medium-sized cations
Dana 8th edition ID:41.5.4.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
Hey's CIM Ref.:19.3.4

19 : Phosphates
3 : Phosphates of Be and Mg
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Occurrences of Hydroxylherderite

Geological Setting:Late stage mineral in miarolitic cavities in complex granitic pegmatites, alteration of beryl or beryllonite, hydrothermal.

Physical Properties of Hydroxylherderite

Lustre:Sub-Vitreous, Resinous, Waxy, Greasy
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colorless, gray, brown, pale yellow, greenish white, light blue, purple; colourless in transmitted light.
Comment:May be blue-green or blue in daylight, lavender or light violet in incandescent light
Streak:white
Hardness (Mohs):5 - 5½
Hardness Data:Measured
Tenacity:Brittle
Cleavage:Poor/Indistinct
On {110}, interrupted.
Fracture:Irregular/Uneven
Density (measured):2.95 g/cm3
Density (calculated):3.00(2) g/cm3

Crystallography of Hydroxylherderite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Cell Parameters:a = 9.789(2) Å, b = 7.661(1) Å, c = 4.804(1) Å
β = 90.02°
Ratio:a:b:c = 1.278 : 1 : 0.627
Unit Cell Volume:V 360.27 ų (Calculated from Unit Cell)
Z:4
Morphology:Stout prismatic crystals [100] or [001]; thick tabular {001}. Commonly pseudo-orthorhombic in aspect, rarely monoclinic; pseudo-hexagonal [001] at times. Also occurs as botryoidal or spheroidal aggregates with a radial-fibrous structure.
Twinning:On {100} or {001} as fishtail contact. Most crystals are twinned; however, some exhibit no outward signs of this morphology.
X-Ray Powder Diffraction:
d-spacingIntensity
3.76 (20)
3.43 (30)
3.14 (10)
3.00 (30)
2.87 (40)
2.55 (20)
2.21 (30)
1.996 (20)
Comments:Am Min 59:919 (1974)

Optical Data of Hydroxylherderite

Type:Biaxial (-)
RI values: nα = 1.589 - 1.615 nβ = 1.610 - 1.634 nγ = 1.619 - 1.643
2V:Measured: 70° to 77°, Calculated: 64°
Birefringence:0.028-0.030
Maximum Birefringence:δ = 0.030

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v inclined
Optical Extinction:inclined

Chemical Properties of Hydroxylherderite

Formula:
CaBe[(OH,F)|PO
 
4
]
Essential elements:Be, Ca, H, O, P
All elements listed in formula:Be, Ca, F, H, O, P

Relationship of Hydroxylherderite to other Species

Series:Forms a series with Herderite (see here)
Common Associates:
TopazQuartzMuscoviteMuscoviteMicrocline
ElbaiteCassiteriteAlbite
Related Minerals - Nickel-Strunz Grouping):

- +
8.BA.05Väyrynenite
Mn
2+
 
Be[(OH,F)|PO
 
4
]
8.BA.10Bergslagite
CaBe[OH|AsO
 
4
]
8.BA.10Herderite
CaBe[(F,OH)|PO
 
4
]
8.BA.15Babefphite
BaBe[(F,OH)|PO
 
4
]
Related Minerals - Hey's Index Grouping:

- +
19.3.1Moraesite
Be
 
2
[OH|PO
 
4
] · 4H
 
2
O
19.3.2Beryllonite
NaBe[PO
 
4
]
19.3.3Hurlbutite
CaBe
 
2
[PO
 
4
]
 
2
19.3.5Glucine
CaBe
 
4
[(OH)
 
2
|PO
 
4
]
 
2
 · 0.5H
 
2
O
19.3.6Fransoletite
Ca
 
3
Be
 
2
[HPO
 
4
|PO
 
4
]
 
2
 · 4H
 
2
O
19.3.7Uralolite
Ca
 
2
Be
 
4
[OH|PO
 
4
]
 
3
 · 5H
 
2
O
19.3.9Pahasapaite
Li
 
8
(Ca,Li,K)
 
10.5
Be
 
24
(PO
 
4
)
 
24
·38H
 
2
O
19.3.10Tiptopite
K
 
2
(Na,Ca)
 
2
Li
 
3
Be
 
6
[OH|(PO
 
4
)
 
3
]
 
2
 · H
 
2
O
19.3.11Gainesite
Na(Na,K)(Be,Li)Zr
 
2
[PO
 
4
]
 
4
 · 1.5-2H
 
2
O
19.3.12Roscherite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)
 
5
Be
 
4
[(OH)
 
4
|(PO
 
4
)
 
6
] · 6H
 
2
O
19.3.13Faheyite
(Mn,Mg,Na)Be
 
2
Fe
 
2
(PO
 
4
)
 
4
·6H
 
2
O
19.3.14Farringtonite
Mg
 
3
[PO
 
4
]
 
2
19.3.15Holtedahlite
Mg
 
2
[OH|PO
 
4
]
19.3.16Althausite
Mg
 
2
[(OH,F)|PO
 
4
]
19.3.17Newberyite
MgHPO
 
4
·3H
 
2
O
19.3.18Phosphorrösslerite
MgHPO
 
4
·7H
 
2
O
19.3.19Bobierrite
Mg
 
3
(PO
 
4
)
 
2
·8H
 
2
O
19.3.20Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
·8H
 
2
O
19.3.21Panethite
(Na,Ca)
 
2
(Mg,Fe
2+
 
)
 
2
[PO
 
4
]
 
2
19.3.22Dittmarite
NH
 
4
MgPO
 
4
·H
 
2
O
19.3.23Struvite
NH
 
4
MgPO
 
4
·6H
 
2
O
19.3.24Hannayite
(NH
 
4
)
 
2
Mg
 
3
H
 
4
(PO
 
4
)
 
4
·8H
 
2
O

Other Names for Hydroxylherderite

Synonyms:
Hydro-fluorherderiteHydro-herderite
Other Languages:
German:Hydroxylherderit
Spanish:Hydroxylherderita

Other Information

Fluorescence in UV light:Weak yellow under SW
Sometimes bright yellow-orange phosphorescence
Other Information:Soluble in acids.

An alteration product of Beryllonite at Newry, Maine, USA.
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 Hydroxylherderite

Reference List:Dana (1884) American Journal of Science: 27: 229.

Des Cloizeaux (1884) Bulletin de la Société française de Minéralogie: 7: 130.

Bertrand in: Des Cloizeaux (1886) Bulletin de la Société française de Minéralogie: 9: 141.

Penfield and Harper (1886) American Journal of Science: 32: 107.

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 760.

Penfield (1894) American Journal of Science: 47: 329 (as Hydro-herderite and Hydro-fluorherderite).

Ford (1912) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 50: 97.

Goldschmidt, V. (1918) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 4: 127.

Palache, C. and Shannon (1928) American Mineralogist: 13: 394.

Hintze, Carl (1931) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4A]: 688.

Yatsevitch (1935) American Mineralogist: 20: 426.

Strunz (1936) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 93: 146.

Leavens, et al., 1978, Compositional and Refractive Index Variations of the Herderite-Hydroxyl-herderite Series, American Mineralogist, v 63, p. 913-917.

Mineralogical Record (1979): 10: 5.

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.: 256.

Internet Links for Hydroxylherderite

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