Armellinoite-(Ce)
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
Formula:
Ca4Ce4+(AsO4)4 · H2O
Colour:
pale yellow to brown–yellow; also honey-yellow, canary-yellow, yellow-greenish, yellow-brown
Lustre:
Vitreous, Resinous
Hardness:
3 - 3½
Specific Gravity:
4.29 (Calculated)
Crystal System:
Tetragonal
Name:
The name honours Gianluca Armellino (born 1962) of Millesimo (Liguria, Italy). Mr. Armellino is an avid and sophisticated researcher and systematic collector specializing in the minerals of Liguria and other specific localities, with specimens only personally collected.
He is the discoverer of this new species and the co-discoverer of poppiite, cortesognoite, molinelloite and piccoliite. Mr. Armellino is also the one who first found more than 80 mineral species new for Italian regions. Some of them [arsenogoyazite, bariopharmacoalumite, barnesite, brandtite, calderónite, čechite, duttonite, franciscanite, gageite, hummerite, natrodufrénite, norrishite, pyrochroite, roscoelite, schröckingerite, talmessite, and wakefieldite-(Y)] represented the first discovery for Italy or Europe.
He is the discoverer of this new species and the co-discoverer of poppiite, cortesognoite, molinelloite and piccoliite. Mr. Armellino is also the one who first found more than 80 mineral species new for Italian regions. Some of them [arsenogoyazite, bariopharmacoalumite, barnesite, brandtite, calderónite, čechite, duttonite, franciscanite, gageite, hummerite, natrodufrénite, norrishite, pyrochroite, roscoelite, schröckingerite, talmessite, and wakefieldite-(Y)] represented the first discovery for Italy or Europe.
Type Locality:
Isostructural with:
Tiny pale yellow to brown-yellow, pseudo-octahedral crystals embedded in associated quartz +/- hematite +/- muscovite +/- cryptomelane matrix.
Unique Identifiers
Mindat ID:
53219
Long-form identifier:
mindat:1:1:53219:8
GUID
(UUID V4):
(UUID V4):
aae5c76b-cd7e-4617-9113-2a0e7233bb9a
IMA Classification of Armellinoite-(Ce)
Approved
Approval year:
2018
Classification of Armellinoite-(Ce)
8.CG.25
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
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 |
|---|---|---|
| Aml-Ce | 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 Armellinoite-(Ce)
Vitreous, Resinous
Transparency:
Translucent
Comment:
resinous to vitreous
Colour:
pale yellow to brown–yellow; also honey-yellow, canary-yellow, yellow-greenish, yellow-brown
Streak:
white
Hardness:
3 - 3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
|| {110} and {100}
|| {110} and {100}
Fracture:
Irregular/Uneven
Density:
4.29 g/cm3 (Calculated)
Optical Data of Armellinoite-(Ce)
Type:
Uniaxial (-)
RI values:
nω = 1.795(5) nε = 1.765(5)
Max Birefringence:
δ = 0.030
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:
Very High
Pleochroism:
Non-pleochroic
Chemistry of Armellinoite-(Ce)
Mindat Formula:
Ca4Ce4+(AsO4)4 · H2O
Crystallography of Armellinoite-(Ce)
Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
I41/a
Setting:
I41/a
Cell Parameters:
a = 10.749(2) Å, b = 10.749(2) Å, c = 12.030(2) Å
Ratio:
a:b:c = 1 : 1 : 1.119
Unit Cell V:
1390 ų
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.983 Å | (36) |
| 4.443 Å | (23) |
| 2.957 Å | (100) |
| 2.398 Å | (14) |
| 1.875 Å | (22) |
| 1.728 Å | (19) |
| 1.612 Å | (13) |
| 1.475 Å | (26) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Armellinoite-(Ce)
General Appearance of Type Material:
pseudo-octahedral crystal embedded in matrix; easily confused with titanite.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Museo delle Collezioni di Mineralogia, Gemmologia, Petrologia e Giacimentologia, Dipartimento di Scienze della Terra “A. Desio”, Università di Milano, catalogue number MCMGPG-H2018-003
Geological Setting of Type Material:
Fe–Mn ore in metaquartzites
Associated Minerals at Type Locality:
Synonyms of Armellinoite-(Ce)
Related Minerals - Strunz-mindat Grouping
| 8.CG. | Ca-Huréaulite | CaMn5(PO4)4 · 4H2O |
| 8.CG. | Fluckite | CaMn2+(AsO3OH)2 · 2H2O |
| 8.CG. | Dondoellite | Ca2Fe(PO4)2 · 2H2O |
| 8.CG. | Alumolukrahnite | Ca[CuAl](AsO4)2(H2O,OH)2 |
| 8.CG.05 | Cassidyite | Ca2Ni(PO4)2 · 2H2O |
| 8.CG.05 | Collinsite | Ca2Mg(PO4)2 · 2H2O |
| 8.CG.05 | Fairfieldite | Ca2Mn2+(PO4)2 · 2H2O |
| 8.CG.05 | Gaitite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.05 | Messelite | Ca2Fe2+(PO4)2 · 2H2O |
| 8.CG.05 | Parabrandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.05 | Anorthoroselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.05 | Talmessite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.05 | Hillite | Ca2Zn(PO4)2 · 2H2O |
| 8.CG.05 | Unnamed (Fe2+-analogue of Parabrandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.10 | Brandtite | Ca2Mn2+(AsO4)2 · 2H2O |
| 8.CG.10 | Roselite | Ca2Co(AsO4)2 · 2H2O |
| 8.CG.10 | Wendwilsonite | Ca2Mg(AsO4)2 · 2H2O |
| 8.CG.10 | Zincroselite | Ca2Zn(AsO4)2 · 2H2O |
| 8.CG.10 | Rruffite | Ca2Cu(AsO4)2 · 2H2O |
| 8.CG.10 | Unnamed (Fe2+-analogue of Brandtite) | Ca2Fe2+(AsO4)2 · 2H2O |
| 8.CG.15 | Ferrilotharmeyerite | CaZnFe3+(AsO4)2(OH) · H2O |
| 8.CG.15 | Lotharmeyerite | CaZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Mawbyite | PbFe3+2(AsO4)2(OH)2 |
| 8.CG.15 | Mounanaite | PbFe3+2(VO4)2(OH,F)2 |
| 8.CG.15 | Thometzekite | PbCu2+2(AsO4)2 · 2H2O |
| 8.CG.15 | Tsumcorite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.15 | Cobaltlotharmeyerite | CaCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Cabalzarite | CaMg2(AsO4)2 · 2H2O |
| 8.CG.15 | Krettnichite | PbMn3+2(VO4)2(OH)2 |
| 8.CG.15 | Cobalttsumcorite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.15 | Nickellotharmeyerite | CaNi2(AsO4)2 · 2H2O |
| 8.CG.15 | Manganlotharmeyerite | CaMn3+2(AsO4)2(OH)2 |
| 8.CG.15 | Schneebergite | BiCo2(AsO4)2(OH) · H2O |
| 8.CG.15 | Nickelschneebergite | BiNi2(AsO4)2(OH) · H2O |
| 8.CG.15 | Yancowinnaite | PbCuAl(AsO4)2OH · H2O |
| 8.CG.15 | Nickeltsumcorite | Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2 |
| 8.CG.15 | Magnesiofluckite | CaMg(AsO3OH)2(H2O)2 |
| 8.CG.20 | Gartrellite | PbCuFe3+(AsO4)2(OH) · H2O |
| 8.CG.20 | Helmutwinklerite | PbZn2(AsO4)2 · 2H2O |
| 8.CG.20 | Zincgartrellite | PbZn2(AsO4)2(H2O,OH)2 |
| 8.CG.20 | Rappoldite | PbCo2(AsO4)2 · 2H2O |
| 8.CG.20 | Phosphogartrellite | PbCuFe3+(PO4)2(OH,H2O)2 |
| 8.CG.20 | Lukrahnite | CaCuFe3+(AsO4)2(OH,H2O)2 |
| 8.CG.25 | Pottsite | (Pb3xBi4-2x)(VO4)4 · H2O (0.8 < x < 1.0) |
| 8.CG.35 | Nickeltalmessite | Ca2Ni(AsO4)2 · 2H2O |
| 8.CG.55 | Irhtemite | Ca4Mg(AsO4)2(HAsO4)2 · 4H2O |
Fluorescence of Armellinoite-(Ce)
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 Armellinoite-(Ce)
mindat.org URL:
https://www.mindat.org/min-53219.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 Armellinoite-(Ce)
Localities for Armellinoite-(Ce)
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 (TL) | |
| Hålenius et al. (2018) +1 other reference |
Quick NavTopUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
