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Lonecreekite
A valid IMA mineral species
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About Lonecreekite
Formula:
(NH4)Fe3+(SO4)2 · 12H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
1.693
Crystal System:
Isometric
Name:
Named by J.E.J. Martini in 1983 after the type locality of Lone Creek Falls cave, South Africa.
This page provides mineralogical data about Lonecreekite.
Unique Identifiers
Mindat ID:
2430
Long-form identifier:
mindat:1:1:2430:9
IMA Classification of Lonecreekite
Approved
IMA Formula:
N3-H4Fe3+(S6+O4)2·12H2O
Approval year:
1982
First published:
1983
Classification of Lonecreekite
7.CC.20
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
C : With medium-sized and large cations
29.5.5.4
29 : HYDRATED ACID AND NORMAL SULFATES
5 : AB(XO4)2·xH2O
29 : HYDRATED ACID AND NORMAL SULFATES
5 : AB(XO4)2·xH2O
25.11.17
25 : Sulphates
11 : Sulphates of Fe and other metals
25 : Sulphates
11 : Sulphates of Fe and other metals
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 |
|---|---|---|
| Lck | 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 Lonecreekite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Hardness:
2 - 3 on Mohs scale
Density:
1.693 g/cm3 (Measured) 1.691 g/cm3 (Calculated)
Optical Data of Lonecreekite
Type:
Isotropic
RI values:
n = 1.483
Surface Relief:
Moderate
Chemistry of Lonecreekite
Mindat Formula:
(NH4)Fe3+(SO4)2 · 12H2O
Element Weights:
Crystallography of Lonecreekite
Crystal System:
Isometric
Class (H-M):
m3(2/m3) - Diploidal
Space Group:
Pa3
Setting:
Pa3
Cell Parameters:
a = 12.302 Å
Unit Cell V:
1,861.77 ų (Calculated from Unit Cell)
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.356 Å | (100) |
| 7.12 Å | (70) |
| 3.289 Å | (65) |
| 4.107 Å | (60) |
| 5.505 Å | (50) |
| 5.027 Å | (25) |
| 1.945 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] | |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 53 : Other minerals with taphonomic origins | <0.4 |
Type Occurrence of Lonecreekite
General Appearance of Type Material:
Xenomorphic crystals, to 0.1 mm,
Place of Conservation of Type Material:
South African Geological Survey Museum, Pretoria, South Africa, LCH002.
Geological Setting of Type Material:
Ceiling of a cave
Associated Minerals at Type Locality:
Synonyms of Lonecreekite
Other Language Names for Lonecreekite
Common Associates
Associations Based on Photo Data:
| 1 photo of Lonecreekite associated with Quartz | SiO2 |
| 1 photo of Lonecreekite associated with Tschermigite | (NH4)Al(SO4)2 · 12H2O |
| 1 photo of Lonecreekite associated with Copiapite | Fe2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 1 photo of Lonecreekite associated with Anatase | TiO2 |
| 1 photo of Lonecreekite associated with Boussingaultite | (NH4)2Mg(SO4)2 · 6H2O |
| 1 photo of Lonecreekite associated with Efremovite | (NH4)2Mg2(SO4)3 |
| 1 photo of Lonecreekite associated with Sabieite | (NH4)Fe3+(SO4)2 |
| 1 photo of Lonecreekite associated with Chabazite-K | (K2,Ca,Na2,Sr,Mg)2[Al2Si4O12]2 · 12H2O |
Related Minerals - Strunz-mindat Grouping
| 7.CC. |
Krunkelbach Valley Uranium deposit, Menzenschwand, St Blasien, Waldshut, Freiburg Region, Baden-Württemberg, Germany