Hurlbutite
A valid IMA mineral species - grandfathered
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About Hurlbutite
Dr. Cornelius S. Hurlbut, jr.
Formula:
CaBe2(PO4)2
Colour:
Greenish white, yellow or colourless
Lustre:
Vitreous, Greasy
Hardness:
6
Specific Gravity:
2.877
Crystal System:
Monoclinic
Name:
Named in 1951 by Mary Emma Mrose in honor of Prof. Cornelius Searle Hurlbut, Jr. [June 30, 1906 Massachusetts, USA â September 1, 2005 Lexington, Massachusetts, USA], American mineralogist, professor of mineralogy at Harvard University, Cambridge, Massachusetts, USA.
Ca analogue of strontiohurlbutite. Has a paracelsian-type structure and may thus be alternatively grouped in a "paracelsian group", alongside with paracelsian, slawsonite, danburite, maleevite, pekovite.
Compare minjiangite which is not a true (structural-chemical) but just chemical (Ba) analogue.
Visit gemdat.org for gemological information about Hurlbutite.
Compare minjiangite which is not a true (structural-chemical) but just chemical (Ba) analogue.
Visit gemdat.org for gemological information about Hurlbutite.Unique Identifiers
Mindat ID:
1953
Long-form identifier:
mindat:1:1:1953:4
GUID
(UUID V4):
(UUID V4):
11d302fd-7e4c-4d3b-8693-321847774e88
IMA Classification of Hurlbutite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1952
Type description reference:
Classification of Hurlbutite
8.AA.15
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
A : With small cations (some also with larger ones)
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
A : With small cations (some also with larger ones)
Dana 7th ed.:
38.3.6.1
38.3.6.1
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
3 : (AB)3(XO4)2
38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
3 : (AB)3(XO4)2
19.3.3
19 : Phosphates
3 : Phosphates of Be and Mg
19 : Phosphates
3 : Phosphates of Be and Mg
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMAâCNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMAâCNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Hrb | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Hrb | 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 Hurlbutite
Vitreous, Greasy
Transparency:
Transparent
Colour:
Greenish white, yellow or colourless
Streak:
White
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.877(5) g/cm3 (Measured) 2.90 g/cm3 (Calculated)
Optical Data of Hurlbutite
Type:
Biaxial (-)
RI values:
nα = 1.595(3) nβ = 1.601(3) nγ = 1.604(3)
2V:
Measured: 70° , Calculated: 70°
Max Birefringence:
δ = 0.009
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, weak.
Optical Extinction:
X = b; Y = c; Z = a.
Chemistry of Hurlbutite
Mindat Formula:
CaBe2(PO4)2
Elements listed:
Crystallography of Hurlbutite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 8.299(1) Å, b = 8.782(2) Å, c = 7.798(3) Å
β = 90.5°
β = 90.5°
Ratio:
a:b:c = 0.945 : 1 : 0.888
Unit Cell V:
568.31 Ă
Âł (Calculated from Unit Cell)
Z:
4
Morphology:
Stout prismatic crystals, spheres with a radial fibrous structure.
In the type material, forms c{001} and m{111} are dominant and are truncated by d{201} and b{010}. On one crystal the form e{101} occurred as a very small face.
In the type material, forms c{001} and m{111} are dominant and are truncated by d{201} and b{010}. On one crystal the form e{101} occurred as a very small face.
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) |
|---|---|---|---|---|---|---|---|
| 0000431 | Hurlbutite | Lindbloom J T, Gibbs G V, Ribbe P H (1974) The crystal structure of hurlbutite: A comparison with danburite and anorthite American Mineralogist 59 1267-1271 |  | 1974 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.67 Ă | (100) |
| 3.03 Ă | (90) |
| 2.78 Ă | (90) |
| 2.21 Ă | (90) |
| 3.50 Ă | (70) |
| 2.50 Ă | (70) |
| 3.28 Ă | (60) |
Comments:
Chandlers Mill Quarry, New Hampshire, USA. Data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4a: Earthâs earliest continental crust | >4.4-3.0 |
| 19 : Granitic intrusive rocks | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Hurlbutite
General Appearance of Type Material:
Stout prismatic crystals to 25 mm.
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, 103923, 104958, 104602, 134548.
Geological Setting of Type Material:
Complex granite pegmatite; observed as an alteration product of beryl.
Associated Minerals at Type Locality:
Reference:
Mrose, M. (1952) Hurlbutite, CaBe2(PO4)2, a new mineral. American Mineralogist: 37: 931â940.
Synonyms of Hurlbutite
Other Language Names for Hurlbutite
German:Cherlbutit
Hurlbutit
Hurlbutit
Russian:Đ„Đ”ŃлбаŃĐžŃ
Simplified Chinese:磷ééçł
Spanish:Cherlbutita
Hurlbutita
Hurlbutita
Common Associates
Associated Minerals Based on Photo Data:
| 11 photos of Hurlbutite associated with Tiptopite | K2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O |
| 11 photos of Hurlbutite associated with Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O |
| 11 photos of Hurlbutite associated with VĂ€yrynenite | BeMn2+(PO4)(OH) |
| 10 photos of Hurlbutite associated with Hydroxylherderite | CaBe(PO4)(OH) |
| 8 photos of Hurlbutite associated with Quartz | SiO2 |
| 7 photos of Hurlbutite associated with Englishite | K3Na2Ca10Al15(PO4)21(OH)7 · 26H2O |
| 7 photos of Hurlbutite associated with Montgomeryite | Ca4MgAl4(PO4)6(OH)4 · 12H2O |
| 6 photos of Hurlbutite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 6 photos of Hurlbutite associated with Beryllonite | NaBePO4 |
| 3 photos of Hurlbutite associated with Beryl | Be3Al2(Si6O18) |
Related Minerals - Strunz-mindat Grouping
| 8.AA.05 | Alarsite | AlAsO4 |
| 8.AA.05 | Berlinite | AlPO4 |
| 8.AA.10 | Beryllonite | NaBePO4 |
| 8.AA.20 | Lithiophosphate | Li3PO4 |
| 8.AA.25 | Nalipoite | NaLi2PO4 |
| 8.AA.30 | Olympite | Na5Li(PO4)2 |
Fluorescence of Hurlbutite
Not fluorescent.
Other Information
Thermal Behaviour:
Difficult to fuse.
Notes:
Very slowly soluble in acids.
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 Hurlbutite
mindat.org URL:
https://www.mindat.org/min-1953.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Hurlbutite
Reference List:
Mrose, Mary E. (1952) Hurlbutite, CaBe2(PO4)2, a new mineral. American Mineralogist, 37 (11-12) 931-940
Localities for Hurlbutite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - 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.
China | |
| Rao +7 other references |
Czech Republic | |
| Stanek J. (1966) |
| Welser |
| CempĂrek |
| CempĂrek et al. (2006) +1 other reference |
Finland | |
| RRUFF ID: R070612 +2 other references |
Spain | |
| & locality references +1 other reference |
| Pura Alfonso - J. C. Melgarejo et al. (2000) |
Sweden | |
| Svensson et al. (2002) |
| Nysten et al. (2006) |
| Langhof et al. (2016) | |
| Nysten et al. (2006) |
USA | |
| Thompson et al. (1998) |
| Dallaire (2022) |
| Mrose (1952) +3 other references |
| Rocks & Minerals: 60: 117. +1 other reference |
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Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA