Reaphookhillite
A valid IMA mineral species
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Formula:
MgZn2(PO4)2 · 4H2O
Colour:
Colorless
Specific Gravity:
3.09 (Calculated)
Crystal System:
Triclinic
Name:
Named after Reaphook Hill, Australia, the type locality.
Type Locality:
Dimorph of:
The Mg analogue of parahopeite. A rare case of a non-silicate oxysalt with separate Zn and Mg sites (compare falsterite, ferraioloite, and šlikite).
Unique Identifiers
Mindat ID:
53368
Long-form identifier:
mindat:1:1:53368:3
IMA Classification of Reaphookhillite
Classification of Reaphookhillite
8.CA.70
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rea | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Reaphookhillite
Colour:
Colorless
Streak:
White
Cleavage:
Perfect
Parallel to {010}.
Parallel to {010}.
Density:
3.09 g/cm3 (Calculated)
Comment:
Calculated from the empirical formula.
Optical Data of Reaphookhillite
Type:
Biaxial (+)
RI values:
nα = 1.583(3) nβ = 1.596(3) nγ = 1.611(3)
2V:
Calculated: 88.7°
Max. Birefringence:
δ = 0.028
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Chemistry of Reaphookhillite
Mindat Formula:
MgZn2(PO4)2 · 4H2O
Element Weights:
Chemical Analysis
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | Mg0.83Zn2.16Mn2+0.02(PO4)2.01 · 3.97H2O |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Reaphook Hill, Martins Well, Pastoral Unincorporated Area, South Australia, Australia | in wt.%, by electron microprobe; empirical formula basis: 12 O apfu |
Crystallography of Reaphookhillite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.7588(12) Å, b = 7.5341(15) Å, c = 5.2786(11) Å
α = 93.44(3)°, β = 91.27(3)°, γ = 91.30(3)°
α = 93.44(3)°, β = 91.27(3)°, γ = 91.30(3)°
Ratio:
a:b:c = 0.764 : 1 : 0.701
Unit Cell V:
228.49 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Bladed crystals.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.577 Å | (100) |
| 4.461 Å | (24) |
| 3.771 Å | (14) |
| 3.158 Å | (13) |
| 2.982 Å | (32) |
| 2.880 Å | (27) |
| 2.775 Å | (14) |
| 2.668 Å | (13) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Reaphookhillite
General Appearance of Type Material:
Colourless, bladed to thin tabular crystals to 0.6 mm across. Overgrowths on parahopeite crystals.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collection of the South Australian Museum, North Terrace, Adelaide, South Australia, Australia, registration number G34798.
Associated Minerals at Type Locality:
Synonyms of Reaphookhillite
Other Language Names for Reaphookhillite
Dutch:Reaphookhilliet
German:Reaphookhillit
Related Minerals - Strunz-mindat Grouping
| 8.CA. | Apexite | NaMg(PO4) · 9H2O |
| 8.CA. | Brandãoite | BeAl2(PO4)2(OH)2(H2O)5 |
| 8.CA. | Davidlloydite | Zn3(AsO4)2 · 4H2O |
| 8.CA.05 | Parafransoletite | Ca3Be2(PO4)2(PO3OH)2 · 4H2O |
| 8.CA.05 | Fransoletite | Ca3Be2(PO4)2(PO3OH)2 · 4H2O |
| 8.CA.10 | Ehrleite | Ca4Be3Zn2(PO4)6 · 9H2O |
| 8.CA.15 | Faheyite | Be2Mn2+Fe3+2(PO4)4 · 6H2O |
| 8.CA.20 | Mccrillisite | NaCs(Be,Li)Zr2(PO4)4 · 1-2H2O |
| 8.CA.20 | Gainesite | Na(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O |
| 8.CA.20 | Selwynite | NaK(Be,Al)Zr2(PO4)4 · 2H2O |
| 8.CA.25 | Pahasapaite | Li8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O |
| 8.CA.30 | Nizamoffite | Mn2+Zn2(PO4)2(H2O)4 |
| 8.CA.30 | Arsenohopeite | Zn3(AsO4)2 · 4H2O |
| 8.CA.30 | Hopeite | ZnZn2(PO4)2 · 4H2O |
| 8.CA.35 | Warikahnite | Zn3(AsO4)2 · 2H2O |
| 8.CA.40 | Phosphophyllite | Zn2Fe 2+(PO4)2 · 4H2O |
| 8.CA.42 | Steinmetzite | Zn2Fe3+(PO4)2(OH) · 3H2O |
| 8.CA.45 | Parascholzite | CaZn2(PO4)2 · 2H2O |
| 8.CA.45 | Scholzite | CaZn2(PO4)2 · 2H2O |
| 8.CA.50 | Keyite | Cu2+3Zn4Cd2(AsO4)6 · 2H2O |
| 8.CA.55 | Pushcharovskite | K0.6Cu18[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2O |
| 8.CA.60 | Prosperite | Ca2Zn4(AsO4)4 · H2O |
| 8.CA.65 | Gengenbachite | KFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2O |
| 8.CA.70 | Parahopeite | Zn3(PO4)2 · 4H2O |
| 8.CA.75 | Stergiouite | CaZn2(AsO4)2 · 4H2O |
| 8.CA.80 | Limousinite | BaCa[Be4P4O16] · 6H2O |
| 8.CA.85 | Minjiangite | BaBe2(PO4)2 |
| 8.CA.85 | Wilancookite | (Ba5Li2◻)Ba6Be24P24O96 · 26H2O |
Other Information
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 Reaphookhillite
mindat.org URL:
https://www.mindat.org/min-53368.html
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References for Reaphookhillite
Reference List:
Miyawaki, Ritsuro, Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47. European Journal of Mineralogy, 31 (1) 197-202 doi:10.1127/ejm/2019/0031-2839
Localities for Reaphookhillite
Showing 2 localities.
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.
Australia (TL) | |
| European Journal of Mineralogy +1 other reference |
Spain | |
| Calvo Rebollar et al. (2022) |
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