Recently Released Special Editions
Phosphate Rare Minerals for the Collector
Primary and Metasomatic phosphates are found mostly in pegmatites, but also occur in many sedimentary deposits. Most of these phosphates look the same. We will attempt to unlock the mystery of these unique minerals which can often contain secondary phosphate minerals.
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Alluaudite
- Sold
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- Locality
- Pleasant Valley mine, Custer Co., South Dakota, United States
- Formula
- (Na,Ca)2(Mn,Mg,Fe2+)(Fe3+,Mn2+)2(PO4)3
- Availability
- Sold
- Size
- 6 x 4 x 5 cm - Sm Cabinet
- Tagged
- phosphate , pegmatite mineral
Tough, compact, fine grained mineral, which usually does not yield secondary phosphates.
Alluaudite is more of a metasomatic exchange product than it is a primary phase with lithium in parent triphyllite being replaced by Na and Ca, according to Paul Moore in Min. Record (1973). Alluaudite occurs in many pegmatites but may also occur in phosphorites.
Alluaudite
- Formula
- (Na,Ca)2(Mn,Mg,Fe2+)(Fe3+,Mn2+)2(PO4)3
- Crystal System
- Monoclinic
- Crystal Habit
- Platy, Fibrous, Nodular
- Cleavage
- Good, Good, None
- Color
- brownish yellow, green, yellow, black
- Streak
- brownish yellow
- Class
- Monoclinic - Prismatic
- Hardness
- 5-5.5
- Collection
- Phillips Collection
- Mineralpedia
- View Alluaudite
- On Dakota Matrix
- Previously Sold Alluaudite
- On Dakota Matrix
- Other Available Alluaudite
- WebMineral
- View Alluaudite
- Mindat
- View Alluaudite
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Alluaudite
- Sold
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- Locality
- Buranga pegmatite, Gatumba dist., Western Prov., Rawanda
- Formula
- (Na,Ca)2(Mn,Mg,Fe2+)(Fe3+,Mn2+)2(PO4)3
- Availability
- Sold
- Size
- 9 x 6 x 6 cm - Sm Cabinet
- Tagged
- phosphate , pegmatite mineral
A good-sized chunk of blackish Alluaudite partially altered to Strengite.
Alluaudite
- Formula
- (Na,Ca)2(Mn,Mg,Fe2+)(Fe3+,Mn2+)2(PO4)3
- Crystal System
- Monoclinic
- Crystal Habit
- Platy, Fibrous, Nodular
- Cleavage
- Good, Good, None
- Color
- brownish yellow, green, yellow, black
- Streak
- brownish yellow
- Class
- Monoclinic - Prismatic
- Hardness
- 5-5.5
- Mineralpedia
- View Alluaudite
- On Dakota Matrix
- Previously Sold Alluaudite
- On Dakota Matrix
- Other Available Alluaudite
- WebMineral
- View Alluaudite
- Mindat
- View Alluaudite
SOLD
Amblygonite
- Sold
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- Locality
- Mount Rubellite Quarries, Hebron, Oxford Co., Maine, United States
- Formula
- LiAlPO4F
- Availability
- Sold
- Size
- 6.5 x 5 x 3 cm - Sm Cabinet
- Tagged
- phosphate , pegmatite mineral
White mass of Amblygonite.
Amblygonite
- Formula
- LiAlPO4F
- Crystal System
- Triclinic
- Crystal Habit
- Columnar, Euhedral Crystals, Prismatic
- Cleavage
- Perfect, Good, Distinct
- Luster
- Vitreous - Pearly
- Color
- white, yellow, gray, bluish gray, greenish gray
- Streak
- white
- Class
- Triclinic - Pinacoidal
- Fracture
- Uneven
- Hardness
- 5.5-6
- On Dakota Matrix
- Previously Sold Amblygonite
- On Dakota Matrix
- Other Available Amblygonite
- WebMineral
- View Amblygonite
- Mindat
- View Amblygonite
