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Posted by: Raymond McDougall on 03.24.2017 | Filed under: Latest, Recent Mineral Updates | Comments (0)

I’ve added some excellent crystals in this new Alberta Selenite Update (click here). These specimens of gypsum, var. selenite were recovered during a project at Willow Creek, near Nanton, Alberta in the early 1990s. These crystals are sharp, lustrous and transparent – many are like crystal models.  And… they have great fluorescence.

Willow Creek selenite crystals are fluorescent under ultraviolet light, exhibiting an “hourglass” pattern that is not visible in natural light. It is clearly visible in short-wave, medium-wave and long-wave ultraviolet, most prominent in short-wave.

These crystals are also phosphorescent – the hourglass pattern remains briefly visible in a green hue in total darkness after the ultraviolet light source is extinguished – the selenite crystal then fades and until it too is dark.

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada – 6.7 cm.

Gypsum var selenite, Willow Creek, Nanton, Alberta, ultraviolet light

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada – 6.7 cm.
Same crystal as in the previous photo, exhibiting fluorescence,
photographed in short-wave ultraviolet light.

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada – 7.2 cm

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada – 6.5 cm

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada – 6.2 cm

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada – 6.2 cm.
Same crystal as in the previous photo, exhibiting fluorescence,
photographed in short-wave ultraviolet light.

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada – 7.6 cm

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta – 5.0 cm

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta – 5.0 cm
Same crystal as in the previous photo, exhibiting fluorescence,
photographed in short-wave ultraviolet light.

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada

Gypsum, var. selenite, Willow Creek, near Nanton, Alberta, Canada – 5.8 cm

Posted by: Raymond McDougall on 01.13.2016 | Filed under: Latest, Recent Mineral Updates | Comments (0)

 

I’ve added a group of diverse minerals in this Peru Update (click here). I have selected these out over various trips – each is a beautiful specimen for the mineral! This update includes a gorgeous rhodonite from Chiurucu, a brilliant alabandite, a super specimen of bournonite cogwheel twins on matrix, a specimen of scheelite coated with bright green stolzite,  fluorescent fluorapatite crystals and more.

Rhodonite, San Martin Mine, Chirucu, Huallanca, Bolognesi, Ancash Dept., Peru
 Rhodonite, San Martin Mine, Chirucu, Huallanca, Bolognesi, Ancash Dept., Peru – 6.0 cm

Stolzite on Scheelite, Mundo Nuevo Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., PeruStolzite on Scheelite, Mundo Nuevo Mine, Huamachuco, Sanchez Carrion Province, La Libertad Dept., Peru – 5.7 cm

Alabandite, Uchucchacua Mine, Oyon Province, Lima Dept., PeruAlabandite, Uchucchacua Mine, Oyon Province, Lima Dept., Peru
Field of View 3.3 cm

Bournonite, Julcani District, Angaraes Prov., Huancavelica Dept., PeruBournonite, Julcani District, Angaraes Prov., Huancavelica Dept., Peru
Field of View 3.5 cm

Fluorapatite on Pyrite, Huanzala Mine, Huallanca Dist., Dos De Mayo Prov., Huanuco Dept., PeruFluorapatite on Pyrite, Huanzala Mine, Huallanca Dist., Dos De Mayo Prov., Huanuco Dept., Peru – 7.9 cm

Fluorapatite on Pyrite, Huanzala Mine, Huallanca Dist., Dos De Mayo Prov., Huanuco Dept., PeruSame specimen as above, under fluorescent lighting

Gypsum var. Selenite on Halite, Salinas de Otuma, Paracas, Pisco, Pisco Province, Ica Dept., Peru Gypsum var. Selenite on Halite, Salinas de Otuma, Paracas, Pisco, Pisco Province, Ica Dept., Peru – 6.7 cm

Enargite, Quiruvilca Mine, Santiago de Chuco Province, La Libertad Department, Peru

Enargite, Quiruvilca Mine, Santiago de Chuco Province, La Libertad Department, Peru – crystal 2.4 cm

Chalcopyrite on Sphalerite, Palomo Mine, Castrovirreyna Province, Huancavelica Department, Peru Chalcopyrite on Sphalerite, Palomo Mine, Castrovirreyna Province, Huancavelica Department, Peru – 3.5 cm

Chalcopyrite on Sphalerite, Palomo Mine, Castrovirreyna Province, Huancavelica Department, Peru

Chalcopyrite on Sphalerite, Palomo Mine, Castrovirreyna Province, Huancavelica Department, Peru – 4.8 cm

Galena and Seligmannite, Palomo Mine, Castrovirreyna Province, Huancavelica Department, Peru

Galena and Seligmannite on Quartz, Palomo Mine, Castrovirreyna Province,
Huancavelica Department, Peru – 4.6 cm