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HULSITE - Zlatý Kopec, Czech Republic | VERY RARE | 20 x 12 x 4 mm | Box & Label

Hulsite, Czech Republic, Thumbnail (1-3 cm)
US$23.95
a8244
1 item(s)
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Mineral: HULSITE
Locality: Zlatý Kopec skarn deposit, Zlatý Kopec, Boží Dar, Karlovy Vary District, Karlovy Vary Region, Czech Republic
Dimension (mm):
20 x 12 x 4 mm

Specimen packed in box of size 38 x 38 x 34 mm with card/label.

Description / Notes: HULSITE forms small black, sometimes radial aggregates, and has a semi-metallic luster.
 

  • Formula:(Fe2+,Mg)2(Fe3+,Sn)(BO3)O2
  • Colour:Black with greenish, brownish, or reddish tinge
  • Lustre:Vitreous, Sub-Metallic
  • Hardness:3
  • Specific Gravity:4.28 - 4.57
  • Crystal System:Monoclinic
  • Member of:Pinakiolite Group
  • Name:Named in 1908 by Adolph Knopf and Waldemar T. Schaller in honor of Alfred Hulse Brooks, American (July 18, 1871 – November 22, 1924), chief geologist in Alaska for the United States Geological Survey from 1903 to 1924.
  • Type Locality:Brooks Mountain, Port Clarence Mining District, Nome Census Area, Alaska, USA
  • IMA Status: Approved, 'Grandfathered' (first described prior to 1959)
 
Further information in mineralogy databases:
 
Classification:
  • 6.Borates
Mineral name:
  • Hulsite
Country origine:
Czech Republic
Specimen size:
Thumbnail (1-3 cm)

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