Landesite
A valid IMA mineral species - grandfathered
This page is currently not sponsored. Click here to sponsor this page.
About Landesite
Kenneth K. Landes
Formula:
Mn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2O
Colour:
red brown; yellowish brown in transmitted light
Lustre:
Sub-Vitreous, Greasy
Hardness:
3 - 3½
Specific Gravity:
3.026
Crystal System:
Orthorhombic
Member of:
Name:
In honor of Kenneth Knight Landes (10 May 1899, Seattle Washington, USA - 21 November 1981, Ann Arbor, Michigan, USA), Professor of Geology, University of Michigan, who extensively studied the pegmatites of Maine, USA and established modern ideas of granite pegmatite paragenesis in 1925.
Type Locality:
Isostructural with:
Occurs as an alteration product of reddingite.
Compare the chemically closely related correianevesite.
Compare the chemically closely related correianevesite.
Unique Identifiers
Mindat ID:
2318
Long-form identifier:
mindat:1:1:2318:0
GUID
(UUID V4):
(UUID V4):
92bfc797-46da-4e02-908f-d6cd27b0d712
IMA Classification of Landesite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mn2+9Fe3+3(PO4)8(OH)3 · 9H2O
Type description reference:
Classification of Landesite
8.CC.05
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
C : With only medium-sized cations, RO4:H2O = 1:1.5
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
C : With only medium-sized cations, RO4:H2O = 1:1.5
40.3.2.4
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
3 : A3(XO4)2·xH2O
19.12.18
19 : Phosphates
12 : Phosphates of Mn
19 : Phosphates
12 : Phosphates of Mn
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 |
|---|---|---|
| Lds | 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 Landesite
Sub-Vitreous, Greasy
Transparency:
Translucent
Colour:
red brown; yellowish brown in transmitted light
Hardness:
3 - 3½ on Mohs scale
Hardness Data:
Measured
Cleavage:
Perfect
On {010}, perfect; one poor at right angles to the perfect cleavage.
On {010}, perfect; one poor at right angles to the perfect cleavage.
Density:
3.026 g/cm3 (Measured) 3.210 g/cm3 (Calculated)
Optical Data of Landesite
Type:
Biaxial (-)
RI values:
nα = 1.720 nβ = 1.728 nγ = 1.735
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:
High
Dispersion:
r < v moderate
Pleochroism:
Visible
Comments:
X (┴ to the inferior cleavage) = Dark brown
Y = Light brown
Z (┴ to the best cleavage) = Yellow
Y = Light brown
Z (┴ to the best cleavage) = Yellow
Comments:
2V(meas.) = Large
Chemistry of Landesite
Mindat Formula:
Mn2+3-xFe3+x(PO4)2(OH)x · (3-x)H2O
Crystallography of Landesite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 9.458(3) Å, b = 10.185(2) Å, c = 8.543(2) Å
Ratio:
a:b:c = 0.929 : 1 : 0.839
Unit Cell V:
822.94 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Dipyramidal
Comment:
Space Group: P bna
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
|---|---|---|---|---|---|---|---|
| 0014472 | Landesite | Moore P B, Araki T, Kampf A R (1980) Nomenclature of the phosphoferrite structure type: refinements of landesite and kryzhanovskite Mineralogical Magazine 43 789-795 |  | 1980 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.207 Å | (100) |
| 5.096 Å | (54) |
| 3.163 Å | (35) |
| 2.758 Å | (29) |
| 4.284 Å | (27) |
| 2.630 Å | (24) |
| 3.090 Å | (23) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Landesite
General Appearance of Type Material:
massive
Place of Conservation of Type Material:
Harvard University, Cambridge, MA USA, 91214
Geological Setting of Type Material:
Granite pegmatite
Associated Minerals at Type Locality:
Reference:
Berman, H., Gonyer, F.A. (1930) Pegmatite minerals in Poland, Maine. American Mineralogist: 15: 375-387.
Other Language Names for Landesite
Relationship of Landesite to other Species
Member of:
Other Members of this group:
| Correianevesite | Fe2+Mn2+2(PO4)2 · 3H2O | Orth. mmm (2/m 2/m 2/m) |
| Garyansellite | (Mg,Fe)3(PO4)2(OH,O) · 1.5H2O | Orth. mmm (2/m 2/m 2/m) |
| Kryzhanovskite | (Fe3+,Mn2+)3(PO4)2(OH,H2O)3 | Orth. mmm (2/m 2/m 2/m) |
| Phosphoferrite | (Fe2+,Mn2+)3(PO4)2 · 3H2O | Orth. mmm (2/m 2/m 2/m) : Pmna |
| Reddingite | (Mn2+,Fe2+)3(PO4)2 · 3H2O | Orth. mmm (2/m 2/m 2/m) : Pmna |
Common Associates
Associated Minerals Based on Photo Data:
| 9 photos of Landesite associated with Triphylite | LiFe2+PO4 |
| 9 photos of Landesite associated with Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
| 6 photos of Landesite associated with Correianevesite | Fe2+Mn2+2(PO4)2 · 3H2O |
| 3 photos of Landesite associated with Reddingite | (Mn2+,Fe2+)3(PO4)2 · 3H2O |
| 1 photo of Landesite associated with Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
| 1 photo of Landesite associated with Rockbridgeite | Fe2+Fe3+4(PO4)3(OH)5 |
| 1 photo of Landesite associated with Mitridatite | Ca2Fe3+3(PO4)3O2 · 3H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CC. | Correianevesite | Fe2+Mn2+2(PO4)2 · 3H2O |
| 8.CC.05 | Garyansellite | (Mg,Fe)3(PO4)2(OH,O) · 1.5H2O |
| 8.CC.05 | Kryzhanovskite | (Fe3+,Mn2+)3(PO4)2(OH,H2O)3 |
| 8.CC.05 | Phosphoferrite | (Fe2+,Mn2+)3(PO4)2 · 3H2O |
| 8.CC.05 | Reddingite | (Mn2+,Fe2+)3(PO4)2 · 3H2O |
| 8.CC.10 | Kaatialaite | Fe(H2AsO4)3 · 5H2O |
| 8.CC.15 | Leogangite | Cu10(AsO4)4(SO4)(OH)6 · 8H2O |
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 Landesite
mindat.org URL:
https://www.mindat.org/min-2318.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Landesite
Reference List:
Localities for Landesite
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.
Brazil | |
| Tom Loomis +1 other reference |
Bulgaria | |
| Kunov et al. (1997) |
Germany | |
| Weiß (1990) |
| www.berthold-weber.de (2001) | |
| Wittern (2001) +1 other reference | |
Namibia | |
| von Bezing (2007) |
Poland | |
| Włodek et al. (2015) |
| Pieczka et al. (2015) |
Rwanda | |
| Daltry et al. (1998) |
Spain | |
| Calvo Rebollar et al. (2022) |
Switzerland | |
| Stalder et al. (1998) |
USA | |
| Januzzi (1994) |
| Mineralogy of Maine |
| King et al. (1994) |
| |
| Mineralogical Record (1991) +1 other reference |
| Ongoing study of Ryerson pegmatite by ... +1 other reference |
| original reference lost +1 other reference |
| Morrill |
Quick NavTopAbout LandesiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany