Juanite
A valid IMA mineral species - grandfathered - questionable
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About Juanite
Formula:
Ca10Mg4Al2Si11O39 · 4H2O or near
Colour:
Nearly white to pistachio-green
Lustre:
Dull
Hardness:
5½
Specific Gravity:
3.01 - 3.3
Crystal System:
Orthorhombic
Name:
Named for the San Juan Mountains, Colorado, USA, that include the type locality.
Unique Identifiers
Mindat ID:
2119
Long-form identifier:
mindat:1:1:2119:3
GUID
(UUID V4):
(UUID V4):
f796d2a2-d395-4173-b60d-287254814f47
IMA Classification of Juanite
Approved, 'Grandfathered' (first described prior to 1959), Questionable
IMA Formula:
Ca10(Mg,Fe2+)4(Si,Al)13(O,OH)39 · 4H2O (?)
Classification of Juanite
9.HA.70
9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
78.7.6.1
78 : Unclassified Silicates
7 :
78 : Unclassified Silicates
7 :
16.11.6
16 : Silicates Containing Aluminum and other Metals
11 : Aluminosilicates of Ca and Mg with or without alkalis
16 : Silicates Containing Aluminum and other Metals
11 : Aluminosilicates of Ca and Mg with or without alkalis
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 |
---|---|---|
Jn | 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 Juanite
Dull
Transparency:
Translucent
Colour:
Nearly white to pistachio-green
Hardness:
5½ on Mohs scale
Density:
3.01 - 3.3 g/cm3 (Measured)
Optical Data of Juanite
Type:
Biaxial (+)
RI values:
nα = 1.640(3) nβ = 1.642 nγ = 1.647(3)
2V:
Measured: 50° , Calculated: 66°
Max Birefringence:
δ = 0.007
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:
Moderate
Dispersion:
relatively weak
Chemistry of Juanite
Mindat Formula:
Ca10Mg4Al2Si11O39 · 4H2O or near
Common Impurities:
Fe,Mn,Na,K,P
Crystallography of Juanite
Crystal System:
Orthorhombic
Morphology:
slender fibers in sheaflike aggregates, to about 1 mm; massive.
Comment:
Orthorhombic (?). Point Group: n.d.; Space Group: n.d. Z = n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.27 Å | (100) |
2.98 Å | (100) |
1.93 Å | (100) |
2.90 Å | (90) |
1.97 Å | (80) |
3.58 Å | (50) |
3.41 Å | (50) |
Type Occurrence of Juanite
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts; National Museum of Natural History, Washington, D.C., USA, 105990.
Associated Minerals at Type Locality:
Reference:
Rodygina, V.G. (1971): The first find of juanite and cebollite in the Kuznetsk Alatau. Geologiya i Geofizika 12, 62-70. (Institute of Geology and Geophysics, Novosibirsk)
Other Language Names for Juanite
Common Associates
Associated Minerals Based on Photo Data:
2 photos of Juanite associated with Alumoåkermanite | (CaNa)Al[Si2O7] |
2 photos of Juanite associated with Cebollite | Ca5Al2(SiO4)3(OH)4 |
Related Minerals - Strunz-mindat Grouping
9.HA. | Qeltite | Ca3TiSi2(Fe3+2Si)O14 |
9.HA. | Kalyuzhnyite-(Ce) | NaKCaSrCeTi(Si8O21)OF(H2O)3 |
9.HA. | Shinichengite | Ca5[BSi2O7(OH)2]2 · 6H2O |
9.HA. | Moragite | Ca3TiSi2(Al2Si)O14 |
9.HA.05 | Ertixiite | Na2Si4O9 |
9.HA.10 | Kenyaite | Na2Si22O41(OH)8 · 6H2O |
9.HA.20 | Wawayandaite | Ca6Mn2BBe9Si6O23(OH,Cl)15 |
9.HA.25 | Magbasite | KBaFe3+Mg7Si8O22(OH)2F6 |
9.HA.35 | Demagistrisite | BaCa2Mn3+4(Si3O10)(Si2O7)(OH)4 · 3H2O |
9.HA.37 | Donwilhelmsite | CaAl4Si2O11 |
9.HA.40 | Igumnovite | Ca3Al2[SiO4]2[◻Cl4] |
9.HA.40 | Kasatkinite | Ba2Ca8B5Si8O32(OH)3 · 6H2O |
9.HA.42 | Paqueite | Ca3TiSi2(Al,Ti,Si)3O14 |
9.HA.45 | Rippite | K2(Nb,Ti)2(Si4O12)O(O,F) |
9.HA.47 | Zagamiite | CaAl2Si3.5O11 |
9.HA.50 | α-Carnegieite | NaAlSiO4 |
9.HA.50 | Rudenkoite | Sr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2O |
9.HA.52 | Atheriastite | near Ca5MgFeAl6Si8O32 · 5H2O |
9.HA.55 | Balvraidite | |
9.HA.55 | Foshallasite | Ca3[Si2O7] · 3H2O(?) |
9.HA.57 | Bhreckite | Ca, Mg, Fe, Si, O, H |
9.HA.60 | Bravaisite | |
9.HA.60 | Nagelschmidtite | Ca7(SiO4)2(PO4)2 |
9.HA.65 | Caryochroite | (Na,Sr)3(Fe3+,Mg)10[Ti2Si12O37] · (H2O,O,OH)17 |
9.HA.75 | Tacharanite | Ca12Al2Si18O33 (OH)36 |
9.HA.80 | Oyelite | Ca10Si8B2O29 · 12.5H2O |
9.HA.85 | Denisovite | K14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4-x) · 2H2O |
9.HA.90 | Tiettaite | K4Na12Fe3+Si16O41(OH)4 · 2H2O |
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 Juanite
mindat.org URL:
https://www.mindat.org/min-2119.html
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Please feel free to link to this page.
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References for Juanite
Localities for Juanite
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).
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.
All localities listed without proper references should be considered as questionable.
Russia | |
| Pavel.M. Kartashov (n.d.) |
| Subbotin et al. (1998) |
USA (TL) | |
| Larsen (1942) +1 other reference |
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Kovdor Massif, Kovdorsky District, Murmansk Oblast, Russia