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Mineralpedia Details for Hendricksite

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Hendricksite

Hendricksite

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Zinc occupies the (M) octahedral sites between the layers of (T) sites of Si and Al. K is the interlayer, making this an ordinary (True) mica. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Hendricksite is the only zinc bearing mica. Occurs as plate-shaped or short prismatic crystals with rough terminations up to 40cm with a copper deep red to blackish red color. (Bernard & Hrysl). As pointed out by Reider et al (Can Min.), Hendricksite could be included in a solid solution series with "zincohendricksite" and "manganoanhendricksite" at the ends.

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Zinc occupies the (M) octahedral sites between the layers of (T) sites of Si and Al. K is the interlayer, making this an ordinary (True) mica. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Occurs as plate-shaped or short prismatic crystals with rough terminations up to 40cm with a copper deep red to blackish red color. (Bernard & Hrysl). As pointed out by Reider et al (Can Min.), Hendricksite could be included in a solid solution series with "zincohendricksite" and "manganoanhendricksite" at the ends.

Formula
KZn3(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Euhedral Crystals, Aggregates, Foliated 
Cleavage
Perfect, None, None 
Color
copper brown, red, reddish black 
Streak
red brown 
Class
Monoclinic - Prismatic 
Hardness
2.5-3 
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Hendricksite from Franklin, Sussex Co., New Jersey, United States

Hendricksite
            from Franklin, Sussex Co., New Jersey, United States
Special Info
Type Locality

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Zinc occupies the (M) octahedral sites between the layers of (T) sites of Si and Al. K is the interlayer, making this an ordinary (True) mica. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Hendricksite is the only zinc bearing mica.

Occurs as plate-shaped or short prismatic crystals with rough terminations up to 40cm with a copper deep red to blackish red color. (Bernard & Hrysl). As pointed out by Reider et al (Can Min.), Hendricksite could be included in a solid solution series with "zincohendricksite" and "manganoanhendricksite" at the ends.

This is a large impressive specimen with large crystal sheets. Occurs in only a handful of worldwide localities.

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