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Labradorite, a feldspar mineral, can display an iridescent optical effect (or Schiller) known as labradorescence. It is an intermediate to calcic member of the plagioclase series. The streak is white, like most silicates. As with all plagioclase members, the crystal system is triclinic. It occurs as clear, white to gray, blocky to lath shaped grains in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites.
Spectrolite is an uncommon variety of labradorite feldspar, which exhibits a richer range of colors than labradorite. Spectrolite was initially a brand name for material mined in Finland, but is sometimes used to describe labradorite whenever a richer display of colors is present, regardless of locality.
Rough, from UKACTUAL AS SEEN: The image shows the EXACT specimen you will receive. The specimen has been carefully hand selected and photographed. Measurements are as accurate as possible, though be aware measuring precise dimensions can be difficult from irregular shaped items. Whilst we portray colours as close to life-like as we can, colours will vary if taken in sunlight, indoors, from monitor to monitor and device to device. Once this specimen is sold, we will update this listing with new similar selected item, with a new photo and dimensions.