Hydroxylherderite
A valid IMA mineral species - grandfathered
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About Hydroxylherderite
Siegmund August Wolfgang von Herder
Formula:
CaBe(PO4)(OH)
Colour:
Colorless, gray, brown, pale yellow, greenish white, light blue, purple; colourless in transmitted light.
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy
Hardness:
5 - 5½
Specific Gravity:
2.95
Crystal System:
Monoclinic
Member of:
Name:
Named "hydro-herderite" in 1894 by Samuel L. Penfield. Named changed to "hydroxyl-herderite" by Palache, Berman, and Frondel in 1954. The root name refers to Siegmund August Wolfgang von Herder (1776-1838), mining official in Freiberg, Germany. The "hydroxyl-" prefix signifies the dominance of hydroxide 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.
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.
Unique Identifiers
Mindat ID:
1962
Long-form identifier:
mindat:1:1:1962:6
GUID
(UUID V4):
(UUID V4):
ddb957ba-0611-4006-b34c-101532f82312
IMA Classification of Hydroxylherderite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1884
Classification of Hydroxylherderite
8.BA.10
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
A : With small and medium-sized cations
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
A : With small and medium-sized cations
41.5.4.2
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
19.3.4
19 : Phosphates
3 : Phosphates of Be and Mg
19 : Phosphates
3 : Phosphates of Be and Mg
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Hhd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Hhd | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Hydroxylherderite
Sub-Vitreous, Resinous, Waxy, Greasy
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:
5 - 5½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
On {110}, interrupted.
On {110}, interrupted.
Fracture:
Irregular/Uneven
Density:
2.95 g/cm3 (Measured) 3.00(2) g/cm3 (Calculated)
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:
0.029
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v inclined
Optical Extinction:
inclined
Pleochroism:
Non-pleochroic
Chemistry of Hydroxylherderite
Mindat Formula:
CaBe(PO4)(OH)
Crystallography of Hydroxylherderite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 9.789(2) Å, b = 7.661(1) Å, c = 4.804(1) Å
β = 90.02°
β = 90.02°
Ratio:
a:b:c = 1.278 : 1 : 0.627
Unit Cell 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.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000413 | Hydroxylherderite | Lager G A, Gibbs G V (1974) A refinement of the crystal structure of herderite, CaBePO4OH American Mineralogist 59 919-925 |  | 1974 | 0 | 293 | |
| 0004661 | Hydroxylherderite | Harlow G E, Hawthorne F C (2008) Herderite from Mogok, Myanmar, and comparison with hydroxyl-herderite from Ehrenfriedersdorf, Germany American Mineralogist 93 1545-1549 | | 2008 | Sauberg mine, Morgenrother Zug, Ehrenfriedersdorf, Germany | 0 | 293 |
| 0013756 | Hydroxylherderite | Long Y (1992) The synthesis and structure of a beryllophosphate crystal with an open framework Journal of Solid State Chemistry 101 199-201 | 1992 | synthetic | 0 | 293 | |
| 0020485 | Hydroxylherderite | Gatta G D, Jacobsen S D, Vignola P, McIntyre G J, Guastella G, Abate L F (2014) Single-crystal neutron diffraction and Raman spectroscopic study of hydroxylherderite, CaBePO4(OH,F) Mineralogical Magazine 78 723-737 | 2014 | Bennett pegmatite, Buckfield, Oxford County, Maine, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.76 Å | (20) |
| 3.43 Å | (30) |
| 3.14 Å | (10) |
| 3.00 Å | (30) |
| 2.87 Å | (40) |
| 2.55 Å | (20) |
| 2.21 Å | (30) |
| 1.996 Å | (20) |
Comments:
Am Min 59:919 (1974)
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Geological Setting:
Late stage mineral in miarolitic cavities in complex granitic pegmatites, alteration of beryl or beryllonite, hydrothermal.
Synonyms of Hydroxylherderite
Other Language Names for Hydroxylherderite
Relationship of Hydroxylherderite to other Species
Member of:
Other Members of this group:
| Bergslagite | CaBeAsO4(OH) | Mon. 2/m : P21/b |
| Herderite | CaBe(PO4)F | Mon. 2/m |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
| 150 photos of Hydroxylherderite associated with Albite | Na(AlSi3O8) |
| 95 photos of Hydroxylherderite associated with Quartz | SiO2 |
| 86 photos of Hydroxylherderite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 67 photos of Hydroxylherderite associated with Microcline | K(AlSi3O8) |
| 47 photos of Hydroxylherderite associated with Lepidolite | |
| 44 photos of Hydroxylherderite associated with Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 43 photos of Hydroxylherderite associated with Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| 34 photos of Hydroxylherderite associated with Cleavelandite | Na(AlSi3O8) |
| 32 photos of Hydroxylherderite associated with Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 28 photos of Hydroxylherderite associated with Topaz | Al2(SiO4)(F,OH)2 |
Related Minerals - Strunz-mindat Grouping
| 8.BA. | Axelite | Na14Cu7(AsO4)8F2Cl2 |
| 8.BA.05 | Väyrynenite | BeMn2+(PO4)(OH) |
| 8.BA.10 | Bergslagite | CaBeAsO4(OH) |
| 8.BA.10 | Herderite | CaBe(PO4)F |
| 8.BA.15 | Babefphite | BaBePO4(F,OH) |
Fluorescence of Hydroxylherderite
Weak yellow under SW
Sometimes bright yellow-orange phosphorescence
Sometimes bright yellow-orange phosphorescence
Other Information
Notes:
Soluble in acids.
An alteration product of Beryllonite at Newry, Maine, USA.
An alteration product of Beryllonite at Newry, Maine, USA.
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 Hydroxylherderite
mindat.org URL:
https://www.mindat.org/min-1962.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Hydroxylherderite
Reference List:
Leavens, Peter B., Dunn, Pete J., Gaines, Richard V. (1978) Compositional and refractive index variations of the herderite-hydroxyl-herderite series. American Mineralogist, 63 (9-10) 913-917
Leavens, Peter B., Wilson, Wendell E., Dunn, Pete J., Wolfe, C. Wroe (1979) Hydroxyl-herderite from Brazil, and a Guide to Species Nomenclature for the Herderite/Hydroxyl-herderite Series. The Mineralogical Record, 10 (1) 5-11
Černá, I., Černý, P., Selway, J. B., Chapman, R. (2002) Paragenesis and origin of secondary beryllophosphates: beryllonite and hydroxylherderite from the BEP granitic pegmatite, southeastern Manitoba, Canada. The Canadian Mineralogist, 40 (5) 1339-1345 doi:10.2113/gscanmin.40.5.1339
Burke, Ernst A. J. (2008) Tidying up mineral names: an IMA-CNMNC scheme for suffixes, hyphens and diacritical marks. The Mineralogical Record, 39 (2) 131-135
Harlow, G. E., Hawthorne, F. C. (2008) Herderite from Mogok, Myanmar, and comparison with hydroxyl-herderite from Ehrenfriedersdorf, Germany. American Mineralogist, 93 (10) 1545-1549 doi:10.2138/am.2008.2943
Localities for Hydroxylherderite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
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Araçuaí, Minas Gerais, Brazil