Hydrodelhayelite
A valid IMA mineral species
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About Hydrodelhayelite
Formula:
KCa2AlSi7O17(OH)2 · 6H2O
Colour:
Grayish-white
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.168
Crystal System:
Orthorhombic
Member of:
Name:
Named for its composition and its relationship to delhayelite.
This page provides mineralogical data about Hydrodelhayelite.
Unique Identifiers
Mindat ID:
1971
Long-form identifier:
mindat:1:1:1971:8
GUID
(UUID V4):
(UUID V4):
fee049b9-f1f7-4631-b787-580c793ddc01
IMA Classification of Hydrodelhayelite
Approved
IMA Formula:
KCa2(Si7Al)O17(OH)2 · 6H2O
First published:
1979
Classification of Hydrodelhayelite
9.EB.10
9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
72.5.1.5
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
17.10.10
17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate
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 |
|---|---|---|
| Hdhy | 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 Hydrodelhayelite
Vitreous
Transparency:
Translucent
Colour:
Grayish-white
Hardness:
4 on Mohs scale
Cleavage:
Perfect
{010} perfect, {100} and {001} imperfect
{010} perfect, {100} and {001} imperfect
Density:
2.168 g/cm3 (Measured) 2.22 g/cm3 (Calculated)
Optical Data of Hydrodelhayelite
Type:
Biaxial
RI values:
nα = 1.503 nγ = 1.518
Max Birefringence:
δ = 0.015
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:
relatively strong
Chemistry of Hydrodelhayelite
Mindat Formula:
KCa2AlSi7O17(OH)2 · 6H2O
Common Impurities:
Ti,Fe,Mn,Mg,Sr,Na,Cl
Crystallography of Hydrodelhayelite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 6.6483 Å, b = 23.8462 Å, c = 7.0727 Å
Ratio:
a:b:c = 0.279 : 1 : 0.297
Unit Cell V:
1,121.28 ų (Calculated from Unit Cell)
Z:
2
Comment:
Space Group: Pnm21
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.923 Å | (100) |
| 3.069 Å | (75) |
| 2.800 Å | (55) |
| 3.319 Å | (43) |
| 6.79 Å | (38) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Hydrodelhayelite
General Appearance of Type Material:
grayish-white alteration product of delhayelite
Place of Conservation of Type Material:
Mining Institute, St. Petersburg, 1178/1; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 79785.
Geological Setting of Type Material:
Supergene zone of an ijolite-urtite pegmatite in an alkaline massif
Associated Minerals at Type Locality:
Reference:
Dorfman, M.D., Chiragov, M.I. (1979) Hydrodelhayelite, a product of supergene alteration of delhayelite. Novye dannye o mineralakh. Nauka, SSSR (New Data on Minerals of the USSR): 28: 172-175.
Synonyms of Hydrodelhayelite
Other Language Names for Hydrodelhayelite
German:Hydrodelhayelit
Spanish:Hydrodelhayelita
Relationship of Hydrodelhayelite to other Species
Member of:
Other Members of this group:
| Delhayelite | (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O | Orth. |
| Fivegite | K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl | Orth. mm2 : Pmn21 |
| Melansonite | Na◻KZrSi8O19 · 5H2O | Orth. mmm (2/m 2/m 2/m) : Pmma |
| Monteregianite-(Y) | (Na,K)6(Y,Ca)2Si16O38 · 10H2O | Mon. 2/m |
| Natromelansonite | Na3Zr[Si7AlO19] · 4H2O | Mon. 2/m : P21/m |
| Rhodesite | KHCa2Si8O19 · 5H2O | Orth. mmm (2/m 2/m 2/m) |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.EB. | Natromelansonite | Na3Zr[Si7AlO19] · 4H2O |
| 9.EB.05 | Macdonaldite | BaCa4Si16O36(OH)2 · 10H2O |
| 9.EB.05 | Rhodesite | KHCa2Si8O19 · 5H2O |
| 9.EB.05 | Melansonite | Na◻KZrSi8O19 · 5H2O |
| 9.EB.10 | Delhayelite | (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O |
| 9.EB.15 | Monteregianite-(Y) | (Na,K)6(Y,Ca)2Si16O38 · 10H2O |
| 9.EB.20 | Carletonite | KNa4Ca4Si8O18(CO3)4(OH,F) · H2O |
| 9.EB.20 | Fluorcarletonite | KNa4Ca4Si8O18(CO3)4F · H2O |
| 9.EB.25 | Günterblassite | (K,Ca,Ba)2(Fe,Ca,Mg,Na)[(Si,Al)13O25(OH)4] · 7H2O · |
| 9.EB.25 | Umbrianite | K7Na2Ca2[Al3Si10O29]F2Cl2 |
| 9.EB.25 | Hillesheimite | (K,Ca,Ba,◻)2(Mg,Fe,Ca,◻)2[(Si,Al )13O23(OH)6](OH) · 8H2O |
| 9.EB.30 | Fivegite | K4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl |
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 Hydrodelhayelite
mindat.org URL:
https://www.mindat.org/min-1971.html
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External Links:
References for Hydrodelhayelite
Localities for Hydrodelhayelite
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.
Italy | |
| Stoppa et al. (2014) |
Russia | |
| |
| World of Stones 95:5-6: 64. +2 other references |
| Pekov I.V. et al. (2010) +1 other reference |
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Koashva Open Pit, Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia