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Crocobelonite-1M
A structural variant of Crocobelonite
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Formula:
CaFe3+2O(PO4)2
Colour:
saffron red to pinkish red
Lustre:
Sub-Vitreous, Greasy
Hardness:
4
Specific Gravity:
3.604 (Calculated)
Crystal System:
Monoclinic
Name:
From Greek κρόκος (saffron) and βελόνα 81 (needle), for the orange-red colour and prismatic to acicular habit of its crystals.
A polytype of Crocobelonite
The most reliable method to distinguish the polymorphs is the X-ray study. In polished thin sections, the 2O and 1M modifications can be distinguished using electron backscatter diffraction (EBSD).
The most reliable method to distinguish the polymorphs is the X-ray study. In polished thin sections, the 2O and 1M modifications can be distinguished using electron backscatter diffraction (EBSD).
Unique Identifiers
Mindat ID:
470532
Long-form identifier:
mindat:1:1:470532:7
IMA Classification of Crocobelonite-1M
Approval history:
Originally proposed as a distinct species (IMA 2021-038), but ruling was for a polymorph.
Classification of Crocobelonite-1M
8.AC.
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
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 |
|---|---|---|
| Ccb | 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 Crocobelonite-1M
Sub-Vitreous, Greasy
Colour:
Saffron red to pinkish red
Comment:
single crystals exhibit distinct dichroism from pink-red to deep-red
Streak:
Orange
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
In one direction
In one direction
Density:
3.604 g/cm3 (Calculated)
Optical Data of Crocobelonite-1M
Type:
Biaxial (-)
RI values:
nα = 1.835(5) nβ = 1.935(5) nγ = 1.955(5)
2V:
Calculated: 44°
Max. Birefringence:
δ = 0.120
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
Y – pale-yellow, Z – deep brownish-orange
Chemistry of Crocobelonite-1M
Mindat Formula:
CaFe3+2O(PO4)2
Element Weights:
Elements listed:
Crystallography of Crocobelonite-1M
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 7.2447(2) Å, b = 6.3832(1) Å, c = 7.3993(2) Å
β = 106.401(2)°
β = 106.401(2)°
Ratio:
a:b:c = 1.135 : 1 : 1.159
Unit Cell V:
328.25 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.98 Å | (17) |
| 4.40 Å | (22) |
| 3.547 Å | (100) |
| 3.485 Å | (21) |
| 3.195 Å | (50) |
| 2.855 Å | (38) |
| 2.389 Å | (33) |
First Recorded Occurrence of Crocobelonite-1M
General Appearance of First Recorded Material:
irregular dense segregations up to 0.5 mm
Place of Conservation of First Recorded Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5683/1 crocobelonite-1M
Geological Setting of First Recorded Material:
Diopside paralava and appear as nests and schlieren up to 30 cm in size situated in brown to red-colored hornfels.
Associated Minerals at First Recorded Locality:
Other Language Names for Crocobelonite-1M
Dutch:Crocobeloniet-1M
German:Crocobelonit-1M
Related Minerals - Strunz-mindat Grouping
| 8.AC. | Magnesioqingheiite | Na2Mg(MgAl)(PO4)3 |
| 8.AC. | Manganobadalovite | NaNaMn(MgFe3+)(AsO4)3 |
| 8.AC. | Changesite-(Y) | (Ca8Y)◻Fe2+(PO4)7 |
| 8.AC. | Babunaite-(Nd) | NdAsO4 |
| 8.AC. | Crocobelonite | CaFe3+2O(PO4)2 |
| 8.AC. | Wopmayite | Ca6Na3◻Mn(PO4)3(PO3OH)4 |
| 8.AC. | Beershevaite | CaFe3+3(PO4)3O |
| 8.AC. | Epiebnerite | (NH4)Zn(PO4) |
| 8.AC. | Ebnerite | (NH4)Zn(PO4) |
| 8.AC.X | Dyrnaesite-(La) | Na8Ce4+(La,REE)2(PO4)6 |
| 8.AC. | Edtollite | K2NaCu5Fe3+O2(AsO4)4 |
| 8.AC. | Angarfite | NaFe3+5(PO4)4(OH)4 · 4H2O |
| 8.AC. | Kabalovite | Fe2+3Fe3+4(PO4)6 |
| 8.AC. | Nazarchukite | Ca2NiFe3+2(PO4)4 |
| 8.AC. | Calciohatertite | NaNaCa(CaFe3+)(AsO4)3 |
| 8.AC. | Alumoedtollite | K2NaCu5AlO2(AsO4)4 |
| 8.AC.02 | Grigorievite | Cu3Fe3+2Al2(VO4)6 |
| 8.AC.02 | Koksharovite | CaMg2Fe3+4(VO4)6 |
| 8.AC.02 | Ziminaite | Fe3+ 6 (VO4)6 |
| 8.AC.05 | Hatertite | Na2(Ca,Na)(Fe3+,Cu)2(AsO4)3 |
| 8.AC.05 | Erikapohlite | Cu3(Zn,Cu,Mg)4Ca2(AsO4)6 · 2H2O |
| 8.AC.05 | 'Unnamed (Na-Mg Arsenate Hydroxyarsenate)' | NaMg3(AsO4)(AsO3OH)2 |
| 8.AC.05 | 'Unnamed (Na-Zn-H Arsenate Hydroxyarsenate)' | Na(Na0.6Zn0.4)Zn2(H0.6AsO4)(AsO3OH)2 |
| 8.AC.05 | Calciojohillerite | NaCaMg3(AsO4)3 |
| 8.AC.05 | Magnesiohatertite | (Na,Ca)2Ca(Mg,Fe3+)2(AsO4)3 |
| 8.AC.05 va | 'Alluaudite-Na[]' | ◻4Na4Mn2+4Fe3+8(PO4)12 |
| 8.AC.05 va | 'Alluaudite-Ca[]' | ◻4Ca4Mn2+4Fe3+8(PO4)12 |
| 8.AC.05 va | 'Ferroalluaudite-NaNa' | Na4Na4Fe2+4Fe3+8(PO4)12 |
| 8.AC.05 | 'Hagendorfite-NaNa' | NaNaFe2+(Mn2+,Mn3+)(PO4)3 (?) |
| 8.AC.05 | O'Danielite | Na(Zn,Mg)3(AsO4)(AsO3OH)2 |
| 8.AC.05 | Howardevansite | NaCuFe2(VO4)3 |
| 8.AC.05 | Khrenovite | Na3Fe3+2(AsO4)3 |
| 8.AC.05 | Zincobradaczekite | NaZn2Cu2(AsO4)3 |
| 8.AC.05 | Paraberzeliite | NaCa2Mg2(AsO4)3 |
| 8.AC.05 | Badalovite | Na2Mg2Fe(AsO4)3 |
| 8.AC.05 | Magnesiocanutite | NaMnMg2[AsO4]2[AsO2(OH)2] |
| 8.AC.05 | Manganohatertite | NaNaCa(MnFe3+)(AsO4)3 |
| 8.AC.05 | Camanchacaite | NaCaMg2[AsO4][AsO3(OH)]2 |
| 8.AC.07 | Zhanghuifenite | Na3Mn4Mg2Al(PO4)6 |
| 8.AC.07 | Ferrobobfergusonite | Na2Fe2+5Fe3+Al(PO4)6 |
| 8.AC.10 | Hagendorfite | NaCaMn2+Fe2+2(PO4)3 |
| 8.AC.10 | 'Ferrohagendorfite' | NaCaFe2+Fe2+2(PO4)3 |
| 8.AC.10 | Johillerite | Na(Mg,Zn)3Cu(AsO4)3 |
| 8.AC.10 | Varulite | NaCaMn2+Mn2+2(PO4)3 |
| 8.AC.10 | Nickenichite | Na0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3 |
| 8.AC.10 |