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Tapiaite

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About TapiaiteHide

Formula:
Ca5Al2(AsO4)4(OH)4·12H2O
Colour:
colorless
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
2.681 (Calculated)
Crystal System:
Monoclinic
Name:
For Enrique Tapia (1955-2008), a well known Chilean mineral collector. Enrique was one of the first and most influential individuals to promote mineral collecting in northern Chile and the Atacama Desert, in particular.
This page provides mineralogical data about Tapiaite.


Classification of TapiaiteHide

Approved
Approval Year:
2014

Physical Properties of TapiaiteHide

Vitreous
Transparency:
Transparent
Colour:
colorless
Streak:
white
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
two perfect cleavages on {101} and
{101}
Fracture:
Splintery
Density:
2.681 g/cm3 (Calculated)

Optical Data of TapiaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.579(1) nβ = 1.588(1) nγ = 1.610(1)
2V:
Measured: 66° (2), Calculated: 66°
Max Birefringence:
δ = 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Pleochroism:
Non-pleochroic

Chemical Properties of TapiaiteHide

Formula:
Ca5Al2(AsO4)4(OH)4·12H2O
IMA Formula:
Ca5Al2(AsO4)4(OH)4 · 12H2O

Crystallography of TapiaiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 16.016(1) Å, b = 5.7781(3) Å, c = 16.341(1) Å
β = 116.704(8)°
Ratio:
a:b:c = 2.772 : 1 : 2.828
Unit Cell V:
1,350.94 ų (Calculated from Unit Cell)
Z:
2
Comment:
P21/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
13.91(100)
7.23(17)
5.39(22)
4.64(33)
3.952(42)
3.290(35)
2.823(39)
2.753(15)

Type Occurrence of TapiaiteHide

General Appearance of Type Material:
blades, flattened on {101¯} and elongated
and striated along [010], up to ~0.5 mm long, and exhibiting the forms {101¯}, {101} and {111}. The blades are commonly intergrown in subparallel bundles and less commonly in sprays.
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 63594, 64123, 64124 and 6412
Geological Setting of Type Material:
The mineral is a late-stage, low-temperature, secondary mineral occurring in narrow seams and vughs in the oxidized upper portion of a hydrothermal sulfide vein hosted by volcanoclastic rocks.
Associated Minerals at Type Locality:

Synonyms of TapiaiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Joteite3 photos of Tapiaite associated with Joteite on mindat.org.

Other InformationHide

Notes:
is easily soluble in room temperature dilute HCl and slowly soluble in H2O.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for TapiaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Mills, S.J., Nash, B., Dini, M. and Molina Donoso, A.A. (2014) Tapiaite, IMA 2014-024. CNMNC Newsletter No. 21, August 2014, page 800; Mineralogical Magazine, 78, 797-804.
Kampf, A. R., Mills, S. J., Nash, B. P., Dini, M., & Molina Donoso, A. A. (2015). Tapiaite, Ca5Al2 (AsO4) 4 (OH) 4· 12H2O, a new mineral from the Jote mine, Tierra Amarilla, Chile. Mineralogical Magazine, 79(2), 345-354.

Internet Links for TapiaiteHide

Localities for TapiaiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Chile (TL)
 
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
Kampf, A. R., Mills, S. J., Nash, B. P., Dini, M., & Molina Donoso, A. A. (2015). Tapiaite, Ca5Al2 (AsO4) 4 (OH) 4· 12H2O, a new mineral from the Jote mine, Tierra Amarilla, Chile. Mineralogical Magazine, 79(2), 345-354.
Mineral and/or Locality  
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