Classification of Delhayelite |
| IMA status: | Approved |
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| Strunz 8th edition ID: | 8/H.38-30
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| Nickel-Strunz 10th (pending) edition ID: | 9.EB.10
9 : SILICATES (Germanates) E : Phyllosilicates B : Double nets with 4- and 6-membered rings |
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| Dana 8th edition ID: | 72.5.1.4
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 |
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| Hey's CIM Ref.: | 17.10.9
17 : Silicates Containing other Anions 10 : Silicates with sulphate, molybdate or tungstate |
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| mindat.org URL: | http://www.mindat.org/min-1251.html Please feel free to link to this page. |
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Type Occurrence of Delhayelite |
| Type Locality: | Mt Shaheru, Mt Nyiragongo, Goma, Kivu, Democratic Republic of Congo (Zaïre) |
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| Year of Discovery: | 1959 |
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Physical Properties of Delhayelite |
| Colour: | Colourless |
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Crystallography of Delhayelite |
| Crystal System: | Orthorhombic |
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| Cell Parameters: | a = 13.06Å, b = 24.65Å, c = 7.04Å
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| Ratio: | a:b:c = 0.53 : 1 : 0.286 |
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| Unit Cell Volume: | V 2,266.38 ų (Calculated from Unit Cell) |
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Optical Data of Delhayelite |
| Type: | Biaxial (-) |
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| RI values: | nα = 1.532 nβ = 1.532 nγ = 1.532 |
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| 2V: | Measured: 83° |
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| Maximum Birefringence: | δ = 0.000
 Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration. |
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| Surface Relief: | Low |
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| Dispersion: | weak |
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Chemical Properties of Delhayelite |
| Formula: | | (Na,K) | | Ca | | Al | | Si | | O | | (Cl | | ,F | | ,SO | | ) | | ·18H | | O |
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| Essential elements: | Al, Ca, Cl, H, Na, O, Si |
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| All elements listed in formula: | Al, Ca, Cl, F, H, K, Na, O, S, Si |
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| Common Impurities: | Ti,Fe,Mn,Mg |
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Relationship of Delhayelite to other Species |
| Related Minerals - Nickel-Strunz Grouping): | |
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| Related Minerals - Hey's Index Grouping: | | 17.10.1 | Nosean | | | 17.10.2 | Pitiglianoite | | | 17.10.3 | Vishnevite | | (Na,K) | | [(SO | | ,CO | | )|Al | | Si | | O | | ] · 2H | | O |
| | 17.10.4 | Haüyne | | (Na,Ca) | | [Al | | Si | | (O,S) | | ](SO | | ,Cl) | | |
| | 17.10.5 | Liottite | | (Na,K) | | Ca | | [Cl | | |(SO | | ) | | |(Al | | Si | | O | | ) | | ] |
| | 17.10.6 | Latiumite | | | 17.10.7 | Tuscanite | | (K(Ca,Na) | | (Si,Al) | | O | | [SO | | ,CO | | ,(OH) | | ]·H | | O |
| | 17.10.8 | Microsommite | | | 17.10.10 | Hydrodelhayelite | | | 17.10.11 | Davyne | | | 17.10.12 | Afghanite | | (Na,Ca,K) | | [(Cl | | ,SO | | ,CO | | ) | | |Al | | Si | | O | | ] · 0.5H | | O |
| | 17.10.13 | Franzinite | | (Na,K) | | Ca | | [(SO | | ) | | |Al | | Si | | O | | ] · 0.5H | | O |
| | 17.10.14 | Giuseppettite | | | 17.10.15 | Sacrofanite | | (Na,Ca,K) | | [{(OH) | | ,SO | | ,CO | | ,Cl | | } | | |Al | | Si | | O | | ] · 0.5H | | O |
| | 17.10.16 | Chessexite | | (Na,K) | | Ca | | (Mg,Zn) | | Al | | [(SO | | ) | | |(SiO | | ) | | ] · 40H | | O |
| | 17.10.17 | Innelite | | Na | | (Ba,K) | | (Mg,Ca,Fe)Ti | | Si | | O | | (OH,F) | | SO | | |
| | 17.10.18 | Thaumasite | | | 17.10.19 | Ellestadite | | | 17.10.20 | Ellestadite-(Cl) | | | 17.10.21 | Ellestadite-(OH) | | | 17.10.22 | Ellestadite-(F) | | | 17.10.23 | Mattheddleite | | | 17.10.24 | Queitite | | | 17.10.25 | Roeblingite | | | 17.10.26 | Yoshimuraite | | | 17.10.27 | Kegelite | | Pb | | (Zn,Fe) | | Al | | (SO | | ) | | Si | | O | | or near |
| | 17.10.28 | Wenkite | | (Ba,K) | | (Ca,Na) | | [(SO | | ) | | |(Si,Al) | | O | | (OH) | | ] · 0.5H | | O |
| | 17.10.29 | Macquartite | | | 17.10.30 | Welinite | |
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Other Names for Delhayelite |
| German names: | |
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| Spanish names: | |
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Other Information |
| Health Warning: | No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. |
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References for Delhayelite |
| Reference List: | American Mineralogist: 44: 1321.
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Internet Links for Delhayelite |
| Search Engines: |
Look for Delhayelite on Google
Look for Delhayelite images on Google |
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| External Links: | Look for Delhayelite on WebmineralLook for Delhayelite on Athena MineralogyLook for Delhayelite on WikipediaLook for Delhayelite on Mineralien AtlasRaman and XRD data at RRUFF projectAmerican Mineralogist Crystal Structure DatabaseSearch for Delhayelite in the Natural History Museum (London) online catalogueDelhayelite details from Handbook of Mineralogy (PDF) |
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Localities for Delhayelite |
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