THE MINERAL VIVIANITE


Vivianite has vibrant colors and a nice sparkle. Many clusters are found inside of fossil clam or snail shells or attached to fossil animal bone. Vivianite is not a display case type mineral. Specimens should be kept from long exposure to light as this can darken a specimen to near blackness. The reason for the darkening is from the oxidation of the iron from +2 to +3 and this change yeilds a darker specimen. The oxidation is accelerated by exposure to light. Vivianite can be enjoyed and then should be put back in a dark cabinet to preserve its beauty for years to come.

PHYSICAL CHARACTERISTICS:

  • Color is blue, green and colorless, darkens upon exposure to light.
  • Luster is vitreous.
  • Transparency crystals are transparent to translucent.
  • Crystal System is monoclinic; 2/m
  • Crystal Habits include radiating clusters of prismatic, acicular, or fiberous crystals. Also earthy and encrusting masses. Often lines the inside of fossil shells.
  • Cleavage is perfect in one direction.
  • Fracture is splintery.
  • Hardness is 1.5 - 2.
  • Specific Gravity is approximately 2.6+ (average for translucent minerals)
  • Streak is white or bluish green.
  • Associated Minerals are siderite, sphalerite, quartz and some secondary ore deposit minerals.
  • Other Characteristics: thin crystals are flexible.
  • Notable Occurances include Maryland and Colorado, USA; Russia; Ukraine and England.
  • Best Field Indicators are color and reaction to light, flexible crystals and crystal habit.
This Site Awarded
Available VIVIANITE specimens:
VIVIANITE specimen VIV-22
$ 85.00 -75% = $ 21.25
Dims: 1.82x1.00x0.89in (4.63x2.53x2.27cm) .... Wt: 1.06oz (30.0g) .... Loc: Cigana mine, Galileia, Minas Gerais, Brazil
This sheaf of vivianite crystals shows excellent form and color, although with limited transparency. The individual crystals are vitreous and well-formed. Keep vivianite specimens out of the light to keep them looking nice (else they turn black and opaque).
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VIV-22
$ 21.25
no photo
see this List of ALL specimens including SOLD ones

 

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