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Title: Sussexite  
Author: World Heritage Encyclopedia
Language: English
Subject: Glaucochroite, Knebelite, Rambergite, Jeffersonite, Manganoan calcite
Collection: Manganese Minerals, Nesoborates
Publisher: World Heritage Encyclopedia


Sussexite from Mine Hill, New Jersey
Category Nesoborates
(repeating unit)
Strunz classification 06.BA.15
Color white to buff, lilac/lavender,[1] pale pink, colorless in transmitted light[1]
Crystal habit As bladed acicular crystals, to 7 mm; cross-vein or radial fibrous, in felted or matted aggregates, nodular.[1]
Crystal system orthorhombic[2]
Luster silky, dull(earthy)[1]
Specific gravity 3.30

Sussexite is a manganese borate mineral MnBO2(OH). Crystals are monoclinic prismatic and typically fibrous in occurrence. Colour is white, pink, yellowish white with a pearly lustre. It has a Mohs hardness of 3 and a specific gravity of 3.12.[3]

It is named after the Franklin Mining District in Sussex County, New Jersey, USA where it was first discovered in 1868.

Sussexite also occurs in France, Italy, Namibia, North Korea, South Africa, Switzerland, and the US states of Michigan, New Jersey, Utah and Virginia.


  1. ^ a b c d
  2. ^
  3. ^ Webmineral data

External links

  • Abandoned Mines of New Jersey

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