Systematic Micaceous Minerals

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Hendricksite

#PD34683

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Data
Provenance
Resources

Locality: Franklin, Sussex Co., New Jersey, United States
Formula: KZn₃(Si₃Al)O₁₀(OH)₂
Availability: Sold
Size: 9 x 8 x 6 cm - Sm Cabinet
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.

Hendricksite

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

Collection: Phillips Collection
Special Info: Type Locality

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

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Lamprophyllite

with Aegerine - #PD34670

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Locality: Yukspor Mt, Khibiny Massif, Kola Peninsula, Russia
Formula: Na₃(SrNa)Ti₃(Si₂O₇)₂O₂(OH)₂
Availability: Sold
Size: 4.5 x 4.5 x 5 cm - Miniature

Lamporphyllite is a sorosilicate containing Sr, Ba and Titanium and is NOT a mica nor micaceous. Bernard and Hyrsl describe Lamprophyllite as elongated crystals, golden to dark brown with a perfect {100} cleavage. It is an accessory mineral in nepheline syenites and their pegmatites.

This is a really handsome specimen with good crystals to 3cm resembling phlogopite in appearance only and is associated with Aegerine.

Lamprophyllite

Formula: Na₃(SrNa)Ti₃(Si₂O₇)₂O₂(OH)₂
Crystal System: Monoclinic
Crystal Habit: Radial, Stellate, Acicular
Cleavage: Good, None, None
Luster: Vitreous - Pearly
Color: yellow, brown
Streak: brownish white
Class: Monoclinic - Prismatic
Fracture: Brittle
Hardness: 2.5

Collection: Phillips Collection

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

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Margarite

#PD34799

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Locality: Chester Emery mines, Hampden Co., Massachusetts, United States
Formula: CaAl₂(Si₂Al₂)O₁₀(OH)₂
Availability: Sold
Size: 11 x 7 x 5.5 cm - Cabinet

Phyllosilicate - Monoclinic - Mica group member. Brittle - Dioctahedral. Al occupying the (M) octahedral positions with sub's of Lithium, Ca (or possibly Na) at the Interlayer spots, and hydroxyl at the (A) positions. Be and Al can replace Si at the (T) positions. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Rarely as good pseudohex. crystals, usually scaly or platy aggregates. Grayish pink to pink, but also yellowish. Occurs mainly with diaspore in contact metamorphic deposits (Bernard & Hrysl), also in chlorite schists (Mindat). Associated with corundum, diaspore, tourmaline, staurolite, glauphane, chlorite, and magnetite...in high aluminun deposits (Handbook of Min.).

This is a large foliated mass rich in Margarite.

Margarite

Formula: CaAl₂(Si₂Al₂)O₁₀(OH)₂
Crystal System: Monoclinic
Crystal Habit: Lamellar, Massive - Lamellar, Scaly
Cleavage: Good, None, None
Luster: Pearly
Color: white, gray, pinkish gray, yellowish gray
Streak: white
Class: Monoclinic - Prismatic
Fracture: Brittle
Hardness: 4

Collection: Phillips Collection

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

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Masutomilite

#PD34814

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Locality: Hirukawa, Gifu Pref., Chubu, Honshu Island, Japan
Formula: KLiAlMn²⁺(Si₃Al)O₁₀(F,OH)₂
Availability: Sold
Size: 3 x 2.5 x 0.1 cm - Thumbnail

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Contains Li, Al, Mn2+ in the (M) octahedral sites with F>OH in the (A) position. Mindat places K & Rb in the Interlayer sites.

Rare worldwide with only in two in the USA, originally described from Japan. According to Bernard & Hyrsl, occurs in Na-Li rich pegmatites in Czech Republic, and Japan and is typically purple to pink.

This is a small cleavage plate.

Masutomilite

Formula: KLiAlMn²⁺(Si₃Al)O₁₀(F,OH)₂
Crystal System: Monoclinic
Crystal Habit: Pseudo Hexagonal
Cleavage: Perfect, None, None
Luster: Vitreous - Pearly
Color: purple pink
Streak: white
Class: Monoclinic - Prismatic
Hardness: 2.5

Collection: Phillips Collection

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

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Montdorite

#PD34815

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Locality: Mont Dore, Charlannes, Auvergne, France
Formula: KFe²⁺_1.5Mn²⁺_0.5Mg_0.5Si₄O₁₀(F,OH)₂
Availability: Sold
Size: Capsule
Special Info: Type Locality

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahderal. Mn in the octahedrally coordinated positions and Fluorine in the (A) position.

Per Lauf, occurs as minute 5-25 micron sized green crystals, in aluminum poor micas and was not found in nature until 1979. Mindat lists 3 worldwide localities all at volcanoes.

This is a small capsule of 2-3mm pieces.

Montdorite

Formula: KFe²⁺_1.5Mn²⁺_0.5Mg_0.5Si₄O₁₀(F,OH)₂
Crystal System: Monoclinic
Crystal Habit: Microscopic Crystals
Color: green, brownish green
Class: Monoclinic - Prismatic
Hardness: -

Collection: Phillips Collection
Special Info: Type Locality

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

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Muscovite

var. fuchsite - #PD34688

Details
Data
Provenance
Resources

Locality: Kola Peninsula, Russia
Formula: KAl₂(Si₃Al)O₁₀(OH)₂
Availability: Sold
Size: 10 x 5.5 x 3.5 cm - Cabinet

Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal. Fuchsite is nothing but a chromium mica containing up to 4.8% Cr2O3 (encycl. of Min.) imparting the green color and was originally described from Schwarzenstein in the Zillerthal and named after J. N. von Fuchs (Dana 6th Ed.).

This specimen contains nice blades of deep blue Kyanite.

Muscovite

Formula: KAl₂(Si₃Al)O₁₀(OH)₂
Crystal System: Monoclinic
Crystal Habit: Massive - Lamellar, Foliated, Micaceous
Cleavage: Perfect, None, None
Luster: Vitreous (Glassy)
Color: white, gray, silver white, brownish white, greenish white
Streak: white
Class: Monoclinic - Prismatic
Fracture: Brittle - Sectile
Hardness: 2-2.5

Collection: Phillips Collection

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

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