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Systematic Micaceous Minerals
Not all micaceous looking minerals fall in the MICA group of phyllosilicate minerals. Many of the other silicates appear micaceous but are not. We'll have a look at some of these minerals and hopefully explain the difference. Take a look at our article on Mica and Other Micaceous Minerals.
Celadonite
- Sold
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- Locality
- near Wadsworth, Washoe Co., Nevada, United States
- Formula
- KMgFe3+Si4O10(OH)2
- Availability
- Sold
- Size
- 9 x 6 x 6 cm - Sm Cabinet
Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal. Mostly or ideally (?) aluminum free mica, with Mg & Fe in the (M) positions. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.
Per (Bernard and Hyrsl) usually as earthy fillings in amygdules and replacement after Augite. Very rare in minute crystals. Also as micaceous scales, widespread in formations of altered volcanic rocks on intermediate basaltic compositions and commonly associated with Montmorillonite.
This is a large chuck of basalt with the typical, dull green earthy celadonite filling amygdules.
Comes with old Hatfield Goudey specimen collected Sept. 9, 1949.
Celadonite
- Formula
- KMgFe3+Si4O10(OH)2
- Crystal System
- Monoclinic
- Crystal Habit
- Earthy, Aggregates, Encrustations
- Cleavage
- Perfect, None, None
- Luster
- Earthy (Dull)
- Color
- gray green, bluish green
- Streak
- greenish white
- Class
- Monoclinic - Prismatic
- Fracture
- Earthy
- Hardness
- 2
- Collection
- Phillips Collection
- Mineralpedia
- View Celadonite
- On Dakota Matrix
- Previously Sold Celadonite
- On Dakota Matrix
- Other Available Celadonite
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- Mindat
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Clintonite
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- Locality
- Amity, Orange Co., New York, United States
- Formula
- CaAlMg2(SiAl3)O10(OH)2
- Availability
- Sold
- Size
- 9 x 9 x 5 cm - Sm Cabinet
- Special Info
- Type Locality
Phyllosilicate - Monoclinic - Mica group member. Brittle Mica - Trioctahderal. Ca, Na, K occupying the Interlayer positions while Mg, Fe2+, Al, Fe3+, Mn in the octahedral positions.
Occurs as tabular, pseudohexagonal, foliated, lamellar radiate crystals. Occurs cheifly in association with calcite, idocrase, grossular, spinel, phlogopite in crystalline limestones i.e. Crestmore (Encycl. of Min.)
This is a large older specimen from the type locality formerly called serberitite.
Clintonite
- Formula
- CaAlMg2(SiAl3)O10(OH)2
- Crystal System
- Monoclinic
- Crystal Habit
- Massive - Lamellar, Radial
- Cleavage
- Perfect, None, None
- Luster
- Pearly
- Color
- colorless, green, yellow, red, reddish brown
- Streak
- colorless
- Class
- Monoclinic - Prismatic
- Fracture
- Brittle
- Hardness
- 4-5
- Collection
- Phillips Collection
- Special Info
- Type Locality
- Mineralpedia
- View Clintonite
- On Dakota Matrix
- Previously Sold Clintonite
- On Dakota Matrix
- Other Available Clintonite
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- View Clintonite
- Mindat
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Diaspore
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- Locality
- Glosam mine, Postmasburg, Northern Cape Province, South Africa
- Formula
- AlO(OH)
- Availability
- Sold
- Size
- 5 x 4 x 3 cm - Miniature
Diaspore is not a mica, but exhibits what some might think is a micaceous habit. Much like this specimen, Diaspore will have elongated plates, may be foliated, scaly with a perfect cleavage. It can occur with magnetite, corundum, spinel, chlorite, dolomite in metamorphic limestines or chlorite schists (Encycl. of Min.)
Diaspore
- Formula
- AlO(OH)
- Crystal System
- Orthorhombic
- Crystal Habit
- Platy, Tabular, Disseminated
- Cleavage
- Perfect, Good, None
- Luster
- Vitreous - Pearly
- Color
- white, greenish gray, grayish brown, colorless, yellow
- Streak
- white
- Class
- Orthorhombic - Dipyramidal
- Fracture
- Brittle - Conchoidal
- Hardness
- 6.5-7
- Collection
- Phillips Collection
- Mineralpedia
- View Diaspore
- On Dakota Matrix
- Previously Sold Diaspore
- On Dakota Matrix
- Other Available Diaspore
- WebMineral
- View Diaspore
- Mindat
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Eastonite
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- Locality
- Williams quarry, Northampton Co., Pennsylvania, United States
- Formula
- KAlMg2(Si2Al2)O10(OH)2
- Availability
- Sold
- Size
- 8 x 4 x 2.5 cm - Sm Cabinet
- Special Info
- Type Locality
Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. One half of the (T) sites occupied by Al. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.
Ideally all the Mg in the (M) sites and is actually in the Biotite series, yet is light in color. Previously thought to be a mixture of phlogopite and a new serpentine (AM Feb. '87 v. 72). Per Lauf (Coll. Guide to Mica Group Minerals) "considered by some author's to be aluminous variety of phlogopite.."
Only four localities worldwide (Mindat).
Eastonite
- Formula
- KAlMg2(Si2Al2)O10(OH)2
- Crystal System
- Monoclinic
- Class
- Monoclinic - Prismatic
- Hardness
- -
- Collection
- Phillips Collection
- Special Info
- Type Locality
- Mineralpedia
- View Eastonite
- On Dakota Matrix
- Previously Sold Eastonite
- On Dakota Matrix
- Other Available Eastonite
- WebMineral
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- Mindat
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