It occurs in association with crandallite and variscite in fractures in aluminous metamorphic rock, in hydrothermal regions and in phosphate rock deposits.
12.
Some of the green to green yellow shades may actually be variscite or faustite, which are secondary phosphate minerals similar in appearance to turquoise.
13.
It is found in association with fluorapatite, wavellite, phosphosiderite, strengite, aldermanite, cacoxenite, variscite, turquoise, fluorite and quartz.
14.
Variscite is a secondary mineral formed by direct deposition from phosphate-bearing water that has reacted with aluminium-rich rocks in a near-surface environment.
15.
The Lucin area is a popular stop for rockhounds looking for an apple-green chert-like phosphate mineral Variscite, also known as Utahlite and Lucinite.
16.
Other natural materials occasionally confused with or used in lieu of turquoise include : variscite and faustite; chrysocolla ( especially when impregnating quartz ); lazulite; smithsonite; hemimorphite; wardite; and a fossil bone or tooth called odontolite or " bone turquoise ", coloured blue naturally by the mineral vivianite.
17.
In the tropics, rather than taranakite, the minerals that form from guano-derived phosphatization of igneous rocks are variscite ( AlPO 4 ?H 2 O ), metavariscite ( AlPO 4 �H 2 O ), barrandite ( ( Al, Fe 3 + ) PO 4 ?H 2 O ), strengite and phosphosiderite ( Fe 3 + PO 4 ?H 2 O ).
