Hillite
A valid IMA mineral species
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About Hillite
Roderick J. Hill
Formula:
Ca2Zn(PO4)2 · 2H2O
Colour:
Colourless to greenish grey
Lustre:
Vitreous, Silky
Hardness:
3½
Specific Gravity:
3.16
Crystal System:
Triclinic
Member of:
Name:
Honouring Dr. Roderick J. Hill (1949, Adelaide, Australia - ), mineralogist and CSIRO management, including Chief of Mineral Research Division at Melbourne, Australia. He first described this mineral as 'zincian collinsite' in 1973. It was later named in his honor by Olga V. Yakubovich, Werner Massa, Ruslan P. Liferovich, Polina G. Gavrilenko, Alla N. Bogdanova, Pekka Tuisku.
Unique Identifiers
Mindat ID:
25585
Long-form identifier:
mindat:1:1:25585:5
GUID
(UUID V4):
(UUID V4):
284ceddf-4ea3-4eb9-9af3-f280989619b2
IMA Classification of Hillite
Classification of Hillite
8.CG.05
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
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 |
|---|---|---|
| Hi | 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 Hillite
Vitreous, Silky
Transparency:
Transparent, Translucent
Colour:
Colourless to greenish grey
Streak:
White
Hardness:
3½ on Mohs scale
Cleavage:
Perfect
on {010} and {001}
on {010} and {001}
Density:
3.16 g/cm3 (Measured)
Chemistry of Hillite
Mindat Formula:
Ca2Zn(PO4)2 · 2H2O
Crystallography of Hillite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.736 Å, b = 6.767 Å, c = 5.462 Å
α = 97.41°, β = 108.59°, γ = 107.19°
α = 97.41°, β = 108.59°, γ = 107.19°
Ratio:
a:b:c = 0.848 : 1 : 0.807
Unit Cell V:
186.05 ų (Calculated from Unit Cell)
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) |
|---|---|---|---|---|---|---|---|
| 0005879 | Hillite | Yakubovich O V, Massa W, Liferovich R P, Gavrilenko P G, Bogdanova A N, Tuisku P (2003) Hillite, a new member of the fairfieldite group: Its description and crystal structure The Canadian Mineralogist 41 981-988 |  | 2003 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.69 Å | (100) |
| 3.04 Å | (40) |
| 3.13 Å | (35) |
| 6.24 Å | (35) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Hillite
General Appearance of Type Material:
Minute tabular crystals to 0.05 mm and wedge-shaped tabular aggregates to 0.2 mm.
Place of Conservation of Type Material:
Museum of Victoria, Melbourne, Australia (M46032).
Geological Setting of Type Material:
Occurs in a small “gossanous” mass covering unmetamorphosed, poorly sorted argillaceous siltstones of Lower Cambrian age.
Associated Minerals at Type Locality:
Synonyms of Hillite
Other Language Names for Hillite
Relationship of Hillite to other Species
Member of:
Other Members of this group:
| Anorthoroselite | Ca2Co(AsO4)2 · 2H2O | Tric. |
| Cassidyite | Ca2Ni(PO4)2 · 2H2O | Tric. |
| Collinsite | Ca2Mg(PO4)2 · 2H2O | Tric. 1 : P1 |
| Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O | Tric. 1 : P1 |
| Gaitite | Ca2Zn(AsO4)2 · 2H2O | Tric. 1 : P1 |
| Messelite | Ca2Fe2+(PO4)2 · 2H2O | Tric. 1 : P1 |
| Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O | Tric. 1 : P1 |
| Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O | Tric. 1 : P1 |
| Talmessite | Ca2Mg(AsO4)2 · 2H2O | Tric. 1 : P1 |
| Unnamed (Fe2+-analogue of Parabrandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
Common Associates
Associated Minerals Based on Photo Data:
| 13 photos of Hillite associated with Scholzite | CaZn2(PO4)2 · 2H2O |
| 10 photos of Hillite associated with Collinsite | Ca2Mg(PO4)2 · 2H2O |
| 1 photo of Hillite associated with Cryptomelane | K(Mn4+7Mn3+)O16 |
| 1 photo of Hillite associated with Chalcophanite | ZnMn4+3O7 · 3H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CG. | Ca-Huréaulite | CaMn5(PO4)4 · 4H2O |
| 8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
| 8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
| 8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
| 8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
| 8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
| 8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
| 8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
| 8.CG.05 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.05 | Unnamed (Fe2+-analogue of Parabrandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.10 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.10 | Rruffite | Ca2Cu(AsO4)2 · 2H2O |
| 8.CG.10 | Unnamed (Fe2+-analogue of Brandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
| 8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
| 8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH,F)2 |
| 8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
| 8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
| 8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
| 8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
| 8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
| 8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
| 8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
| 8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
| 8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
| 8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
| 8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
| 8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
| 8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
| 8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
| 8.CG.25 | Pottsite | (Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0) |
| 8.CG.25 | Armellinoite-(Ce) | Ca4Ce4+(AsO4)4 · H2O |
| 8.CG.35 | Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O |
| 8.CG.55 | Irhtemite | Ca4Mg(AsO4)2(HAsO4)2 · 4H2O |
Fluorescence of Hillite
Weak, greenish yellow fluorescence in short-wave UV light.
Other Information
Notes:
Soluble in hydrochloric acid, after several hours at room temperature.
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 Hillite
mindat.org URL:
https://www.mindat.org/min-25585.html
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References for Hillite
Reference List:
Hill, R. J., Milnes, A. R. (1974) Phosphate minerals from Reaphook Hill, Flinders Ranges, South Australia. Mineralogical Magazine, 39 (306) 684-695 doi:10.1180/minmag.1974.039.306.06
Yakubovich, O. V., Massa, W., Liferovich, R. P., Gavrilenko, P. G., Bogdanova, A. N., Tuisku, P. (2003) Hillite, a new member of the fairfieldite group: its description and crystal structure. The Canadian Mineralogist, 41 (4) 981-988 doi:10.2113/gscanmin.41.4.981
Mandarino, Joseph A. (2004) New minerals. The Canadian Mineralogist, 42 (3) 921-945 doi:10.2113/gscanmin.42.3.921
Localities for Hillite
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) | |
| Yakubovich et al. (2003) +1 other reference |
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Reaphook Hill, Martins Well station, South Flinders Ranges, Flinders Ranges, South Australia, Australia