SIGLOITE

    Class : Phosphates, arsenates, vanadates
    Subclass : Hydrated phosphates
    Crystal system : Triclinic
    Chemistry : FeAl2(PO4)2(OH)3 7H2O
    Rarity : Very rare

Sigloite is a very rare phosphate known in wavellite and quartz geodes. It is an oxidation mineral of paravauxite that it frequently replaces (pseudomorph). Its name comes from its discovery site : the Siglo XX mine (Bolivia). Sigloite occurs in small, short prismatic to thick tabular crystals and are straw yellow to light brown in color.

Main photo : Sigloite pseudomorph after paravauxite from Siglo XX Mine, Bolivia © Gianfranco Ciccolini

Sigloite in the World

The best sigloite crystals measure barely 1 cm and come from the type locality: the Siglo XX mine (Bolivia). It is also known in the United States at Coon Creek Mine (Arkansas).

Sigloite in France

In France, sigloite is known at La Fumade (Tarn).

Twinning

No twinning known for this mineral species.

Fakes and treatments

No fakes listed for this mineral species.


Hardness : 3
Density : 2.35
Fracture : Undetermined
Streak : White

TP : Translucent
RI : 1.563 to 1.619
Birefringence : 0.056
Optical character : Biaxial +
Pleochroism : None
Fluorescence : None

Solubility : -

Magnetism : NoneRadioactivity : None

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