Pyroaurite-2H (original) (raw)
A material that is NOT an approved mineral species
About Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
Formula:
Mg6Fe3+2(OH)16(CO3) · 4H2O
Colour:
White, yellowish green, brownish green, yellowish white, brownish white
Lustre:
Vitreous, Waxy, Pearly
Specific Gravity:
2.08 - 2.14
Name:
Named for the structural relationship to pyroaurite. Originally named sjögrenite by Clifford Frondel in 1940 in honor of Stens Anders Hjalmar Sjögren (1856-1922), Professor of Mineralogy, University of Stockholm, Sweden.
A polytype of Pyroaurite
Originally named sjögrenite. Subsequently recognised as a polytype of pyroaurite and accordingly discredited as a species (Mills et al., 2012).
Unique IdentifiersHide
This section is currently hidden. Click the show button to view.
Long-form identifier:
mindat:1:1:3678:4
d6da6864-406e-403d-ab6b-180be82774af
Classification of Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
5.DA.45
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.6.1.3
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
6 : AmBn(XO3)pZq
xH2O & with (m+n):p = 8:1
11.13.3
11 : Carbonates
13 : Carbonates of Fe
Physical Properties of Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
Colour:
White, yellowish green, brownish green, yellowish white, brownish white
Density:
2.08 - 2.14 g/cm3 (Measured) 2.11 g/cm3 (Calculated)
Optical Data of Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
RI values:
_n_ω = 1.573 _n_ε = 1.550
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
Mindat Formula:
Mg6Fe3+2(OH)16(CO3) · 4H2O
Crystallography of Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
Class (H-M):
6/m m m _(_6/_m_2/_m_2/m ) - Dihexagonal Dipyramidal
Cell Parameters:
a = 3.113(3) Å, c = 15.61(1) Å
Unit Cell V:
131.01 ų (Calculated from Unit Cell)
Morphology:
Thin plates {0001}, with a hexagonal outline and striated and indistinct lateral faces.
X-Ray Powder DiffractionHide
This section is currently hidden. Click the show button to view.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.78 Å | (10) |
| 3.90 Å | (6) |
| 2.65 Å | (4) |
| 2.54 Å | (5) |
| 2.39 Å | (3) |
| 2.21 Å | (5) |
| 1.87 Å | (5) |
First Recorded Occurrence of Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
Synonyms of Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
Other Language Names for Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
Common AssociatesHide
This section is currently hidden. Click the show button to view.
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
This section is currently hidden. Click the show button to view.
Other InformationHide
This section is currently hidden. Click the show button to view.
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 Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
References for Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
Reference List:
Mills, S. J., Christy, A. G., Génin, J.-M. R., Kameda, T., Colombo, F. (2012) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76 (5) 1289-1336 doi:10.1180/minmag.2012.076.5.10
Localities for Pyroaurite-2HHide
This section is currently hidden. Click the show button to view.
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
This section is currently hidden. Click the show button to view.
- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.