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Petedunnite
Current inventory:  0 gems
 

  
Petedunnite is named after Dr. Pete J. Dunn, Mineralogist Department of Mineral Sciences, Smithsonian Institution, Washington, D.C., USA, who studied and made major contributions to the mineralogy of the Franklin, New Jersey Mining District.

Discovered in 1983;   IMA status: Valid (IMA Approved 1987).

Chemistry

Chemical Formula:

Ca(Zn,Mn²⁺,Fe²⁺,Mg)Si₂O₆  

Calcium Zinc Manganese Iron Magnesium Silicate

Molecular Weight:

246.86 gm

Composition: 

Classification

Mineral Classification:

Silicates

Strunz 8th Ed. ID:

8/F.01-80

Nickel-Strunz 10th Ed. ID:

9.DA.15

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si₂O₆; pyroxene family

Related to:

Pyroxene Group. Clinopyroxene Subgroup. Hedenbergite - Petedunnite solid solution.

Synonyms:

IMA1983-073

Crystal Data

Crystallography:

Monoclinic - Prismatic

Crystal Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes containing abundant inclusions.

Twinning:

None

Physical Properties

Cleavage:

[110] Distinct/Good

Fracture:

Irregular/Uneven, Conchoidal

Tenacity:

Brittle

Moh's Hardness:

5.0 - 6.0

Density:

3.68 (g/cm³)

Luminescence:

None

Radioactivity:

Not Radioactive

Optical Properties

Color:

Dark green; in transmitted light, light Yellow to pale Green

Transparency:

Translucent

Luster:

Vitreous

Refractive Index:

1.68 - 1.70  Biaxial ( + )

Birefringence:

0.0200

Dispersion:

Strong; r > v

Pleochroism:

X = Y = light yellow; Z = light green

Occurances

Geological Setting:

In a metamorphosed stratiform zinc deposit, apparently formed under relatively high activity of sulfur and oxygen.

Common Associations:

Albite, Calcite, Gahnite, Garnet, Genthelvite, Sphalerite, Willemite

Common Impurities:

Al, Fe, Na

Type Locality:

Buckwheat Pit (Southwest Opening; Buckwheat Mine), Franklin, Franklin Mining District, Sussex Co., New Jersey, USA

Year Discovered:

1983

View mineral photos:

Petedunnite Mineral Photos and Locations

More Information

Mindat.org
Webmineral.com

Petedunnite is a very rare mineral that is a member of the Pyroxene Group of minerals that includes Aegirine, Diopside, Hedenbergite, Hypersthene, Jadeite, Petedunnite and Spodumene. Petedunnite is only available from one source: Franklin, Franklin Mining District, Sussex County, New Jersey, USA. It is found as anhedral grains; granular without the expression of crystal shapes and containing abundant inclusions.
 

  
Petedunnite gems for sale:

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