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>> Group(s) : phosphates
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Identified in 1825 in Bohemia in iron deposits, its name comes from the Greek "kakos", for bad, and "xenos", for guest or stranger to indicate that its presence in the iron ore was not appreciated: this phosphate makes the metal iron ore work, harder.
The cacoxenite is appreciated as inclusions in the quartz from Brazilian amethysts, where it forms very fine inclusions.

Exploited sites

It is found in Brazil in Minas Gerais, the United States, Canada, Japan, Australia, Rwanda in Africa, England, Ireland, Slovakia, Czech Republic...

See pictures of the mines / other pictures

Use in jewelry

When is found as inclusions in the amethyst or clear quartz, it is cut into cabochons or faceted.
Quartz containing the association cacoxénite, lepidocrocite and iron oxides such as hematite or goethite are sought by healers who attribute to it important properties.

Daily care and precautions

its acicular crystals are very fragile

Looking alike stones

pyrophyllite , rutile

Historical healing properties

It is considered a "shield stone" it would send back the negative waves to the source that issues them. It would thus protect from destabilization attempts and negative actions from the outside. Some even think it would be able to transform negative vibes in positive beneficial forces

Chemical characteristics
Fe24Al[PO4]17O6 (OH)12 - 17 H2O

hydrated iron and aluminium phosphate

Physical characteristics

Main color : yellow

Other colors : brown, orange

Color of streak : yellow

Luster : silky

Hardness : 3.0 to 4.0

Density : 2.20 to 2.60

Cleavage : none

Fracture : uneven

small flat portions on the cleavage

Optical properties

Transparency : translucent

Refractive Index : 1.570 - 1.660

Double refraction : 0.050

Uniaxial positive

visible double refraction : no

Dispersion : -

Pleochroism : weak

Number of colors : 2

Shades from light yellow to orange

Fluorescence : none

Inclusions : it is what constitutes inclusions in other minerals


Most often included in other minerals such as quartz but also in acicular crystals forming fiber-radiated balls


Crystal system : hexagonal

Other informations
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