Micaceous Minerals 3

SOLD

Annite

#19645

Details
Data
Provenance
Resources

Locality: Bigwood Township, Sudbury, Ontario, Canada
Formula: KFe²⁺₃(Si₃Al)O₁₀(OH)₂
Availability: Sold
Size: 5 x 4 x 3 cm - Miniature

Dark black cleavable plates to 2cm.

Annite is the iron rich, OH end member, of the Biotite- Phlogopite series. Common in schists, worldwide, occuring up to 3meters (!!) as crystals in granites of Cape Ann near Rockport, Mass. USA, and crystals up to 15cm from MSH (Bernard & Hrysl). Sometimes forming pseudohexagonal outlines, and foliated masses, in Mg poor igneous and metamorphc rocks.

Phyllosilicate Mica group member. Ordinary (True or Common) Mica - Trioctahderal. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Annite

Formula: KFe²⁺₃(Si₃Al)O₁₀(OH)₂
Crystal System: Monoclinic
Cleavage: Perfect, None, None
Luster: Sub Metallic
Color: reddish brown, black
Streak: brownish white
Class: Monoclinic - Prismatic
Hardness: 2.5-3

Mineralpedia: View Annite
On Dakota Matrix: Previously Sold Annite
On Dakota Matrix: Other Available Annite
WebMineral: View Annite
Mindat: View Annite

SOLD

Anthophyllite

#46713

Details
Data
Provenance
Resources

Locality: Søndeled, Risør, Aust-Agder, Norway
Formula: □Mg₇Si₈O₂₂(OH)₂
Availability: Sold
Size: 7 x 6 x 3 cm - Sm Cabinet

A tightly compacted of bladed micaceous-like crystals to 2cm.

Anthophyllite is not a Mica, nor a phyllosilicate. Anthophyllite is a inosilicate - 2D infinite chains of silicate tetrahedra, which, morphologically resemble a phyllosilicate network. Anthophyllite occurs as bladed aggregates, much like this specimen, and on a smaller scale shows lamellar with elastic fibers and easy to mistake for a mica mineral. Bladed aggregates have perfect cleavages and are commonly lamellar with elastic fibers which resemble mica cleavages.

Typically found in medium to high grade metamorphic amphibolites and gneisses. Associated with talc, chlorite, and micas. (Handbook of Mineralogy).

Anthophyllite

Formula: [box]Mg₇Si₈O₂₂(OH)₂
Crystal System: Orthorhombic
Crystal Habit: Fibrous, Lamellar, Massive
Cleavage: Perfect, Distinct, Distinct
Luster: Vitreous - Pearly
Color: white, greenish gray, green, clove brown, brownish green
Streak: gray
Class: Orthorhombic - Dipyramidal
Fracture: Conchoidal
Hardness: 5-6

Collection: Polak Collection

Mineralpedia: View Anthophyllite
On Dakota Matrix: Previously Sold Anthophyllite
On Dakota Matrix: Other Available Anthophyllite
WebMineral: View Anthophyllite
Mindat: View Anthophyllite

SOLD

Astrophyllite

#DP34933

Details
Data
Provenance
Resources

Locality: Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada
Formula: K₂NaFe²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F
Availability: Sold
Size: 5.5 x 3.5 x 2 cm - Sm Cabinet

Astrophyllite is an inosilicate with a {010} perfect cleavage. This specimen shows beautiful groups of radial bronze, bladed crystals 6mm resembling a mica in Albite matrix. However, it is not phyllosilicate and thus not a mica either. It typically occurs in pegmatites, nepheline syenites and alkaline granites such as Mont Saint-Hilaire,

Astrophyllite

Formula: K₂NaFe²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F
Crystal System: Triclinic
Crystal Habit: Bladed, Stellate, Crystalline - Fine
Cleavage: Perfect, None, None
Luster: Adamantine - Pearly
Color: brown, brownish red, bronze yellow, gold yellow
Streak: yellowish brown
Class: Triclinic - Pedial
Fracture: Brittle
Hardness: 3-3.5

Collection: Polak Collection

Mineralpedia: View Astrophyllite
On Dakota Matrix: Previously Sold Astrophyllite
On Dakota Matrix: Other Available Astrophyllite
WebMineral: View Astrophyllite
Mindat: View Astrophyllite

SOLD

Astrophyllite

#PD39994

Details
Data
Provenance
Resources

Locality: Langesundsfjorden, Larvik, Vestfold, Norway
Formula: K₂NaFe²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F
Availability: Sold
Size: 4 x 3.5 x 5 cm - Miniature

At first glance this looks like a biotite mica. It is actually not even micaceous even though it looks micaceous. The crystals are brown, shiny, and platy, which only looks like mica but is placed in this Special Edition to show the similarity of the two minerals.

Astrophyllite

Formula: K₂NaFe²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F
Crystal System: Triclinic
Crystal Habit: Bladed, Stellate, Crystalline - Fine
Cleavage: Perfect, None, None
Luster: Adamantine - Pearly
Color: brown, brownish red, bronze yellow, gold yellow
Streak: yellowish brown
Class: Triclinic - Pedial
Fracture: Brittle
Hardness: 3-3.5

Collection: Phillips Collection

Mineralpedia: View Astrophyllite
On Dakota Matrix: Previously Sold Astrophyllite
On Dakota Matrix: Other Available Astrophyllite
WebMineral: View Astrophyllite
Mindat: View Astrophyllite

SOLD

Biotite

#PD46685

Details
Data
Provenance
Resources

Locality: Broken Hill, New South Wales, Australia
Availability: Sold
Size: 6 x 3 x 1 cm - Sm Cabinet

A cleavable mass of dark black Biotite.

Biotite has historically been treated as an individual mineral species and also treated as a generic dark mica in the field for those geologist without the aid of a portable XRd. Rieder et. al in the Canadian Mineralogist v. 36 (1998), reclassified and placed Biotite within the Annite-Phlogopite series.

Biotite is a phyllosilicate of the Mica group. Ordinary (True or Common) Mica - with flexible cleavage plates. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Biotite

Formula: K(Mg,Fe++)3[AlSi3O10(OH,F)2
Crystal System: Monoclinic
Crystal Habit: Micaceous, Lamellar, Pseudo Hexagonal
Cleavage: Perfect, None, None
Luster: Vitreous - Pearly
Color: dark brown, greenish brown, blackish brown, yellow, white
Streak: gray
Class: Monoclinic - Prismatic
Fracture: Uneven
Hardness: 2.5-3

Collection: Phillips Collection

On Dakota Matrix: Previously Sold Biotite
On Dakota Matrix: Other Available Biotite
WebMineral: View Biotite
Mindat: View Biotite

SOLD

Celadonite

#DP34932

Details
Data
Provenance
Resources

Locality: Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada
Formula: KMgFe³⁺Si₄O₁₀(OH)₂
Availability: Sold
Size: 3 x 2 x 1 cm - Thumbnail

Green fine grained Celadonite. Celadonite is a phyllosilicate and mica group member. It is an 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.

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: Polak Collection

Mineralpedia: View Celadonite
On Dakota Matrix: Previously Sold Celadonite
On Dakota Matrix: Other Available Celadonite
WebMineral: View Celadonite
Mindat: View Celadonite

New Minerals

Daily Five Minerals

Special Editions
by Mineral Gallery

All Mineral Specimens
A to Z

Searches

Searches

Recently Released Special Editions