Vesuvianite
Iridescence
From Wicki:
Iridescence (also known as goniochromism) is an optical phenomenon of surfaces in which hue changes in correspondence with the angle from which a surface is viewed.
Iridescence is caused by multiple reflections from multi-layered, semi-transparent surfaces in which phase shift and interference of the reflections modulates the incident light (by amplifying or attenuating some frequencies more than others).
The word iridescence is derived in part from the Greek word iris (pl. irides), meaning "rainbow", which in turn derives from the goddess Iris of Greek mythology, who is the personification of the rainbow and acted as a messenger of the gods. Goniochromism is derived from the Greek words gonia, which means angle, and chroma, which means color.
EXPLORED 2009-06-20 #261
Iridescence
From Wicki:
Iridescence (also known as goniochromism) is an optical phenomenon of surfaces in which hue changes in correspondence with the angle from which a surface is viewed.
Iridescence is caused by multiple reflections from multi-layered, semi-transparent surfaces in which phase shift and interference of the reflections modulates the incident light (by amplifying or attenuating some frequencies more than others).
The word iridescence is derived in part from the Greek word iris (pl. irides), meaning "rainbow", which in turn derives from the goddess Iris of Greek mythology, who is the personification of the rainbow and acted as a messenger of the gods. Goniochromism is derived from the Greek words gonia, which means angle, and chroma, which means color.
EXPLORED 2009-06-20 #261