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Rare Minerals of Franklin-Sterling Hill III

Wednesday, 30 August 2017 08:00 PM

Releasing another lot of Franklin/Sterling Hill minerals from various collections but mostly the Phillips' Collection. This is a locality charished by those who not only enjoy rare species, but also fluorescent minerals. 

Fluorite

with Magnetite - #DS47374
Locality
Franklin, Sussex Co., New Jersey, United States 
Formula
CaF2 
Availability
Sold
Size
4.5 x 4 x 3 cm - Miniature 

Granular, coarse dark purple Fluorite with Magnetite, some sulfides, and a red crystalline mineral which is probably a garnet or even Rhodonite.


Fluorite

Formula
CaF2 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Massive - Granular, Disseminated 
Cleavage
Three perfect, octahedral cleavages. 
Luster
Vitreous (Glassy) 
Color
purple, clear, yellow, green, red, blue 
Streak
white 
Geological Setting
Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments  
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
Collection
Shultz Collection
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On Dakota Matrix
Previously Sold Fluorite
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Franklinite

with Willemite & Alleghanyite - #PD47409
Locality
Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States 
Formula
ZnFe3+2O4 
Availability
Sold
Size
5 x 5 x 3 cm - Miniature 

Brilliant, flashy Franklinite crystals to 1mm showing multiple modified crystal forms with acicular, colorless Willemite, and light yellow Barite crystals. The Barite crystals are not all that spectacular and are sparse. According to the olf Gerstmann tag (se prov tab) wthe specimen should have Alleghanyite crystals. I do not see them, but I do not know Franklin very well. The specimn is very similar to the specimen of Modris Baum's under Alleghanyite on Mindat. On the back side there are white to colorless crystals that look like Calcite with needles of Willemite.


Franklinite

Formula
ZnFe3+2O4 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
black, brownish black 
Streak
reddish brown 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
5.5-6 
Collection
Phillips Collection

Friedelite

#DS47372
Locality
Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States 
Formula
Mn2+8Si6O15(OH)10 
Availability
Sold
Size
6 x 3.5 x 2.5 cm - Sm Cabinet 

Orange-pink micro crystals, less than 0.3mm, in a small 5mm area. The rest is also Friedelite, but not as well crystallized. Old Ward's specimen.


Friedelite

Formula
Mn2+8Si6O15(OH)10 
Crystal System
Monoclinic 
Crystal Habit
Massive, Tabular 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown, brown red, yellow, light pink, dark red 
Streak
pink 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
4-5 
Collection
Shultz Collection

Galena

in Calcite - #PD47350
Locality
Franklin, Sussex Co., New Jersey, United States 
Formula
PbS 
Availability
Sold
Size
12 x 8 x 5.5 cm - Cabinet 
Tagged
sulfide  

Large specimen of fluorescent Calcite with crystalline grains of Galena to 1cm.


Galena

Formula
PbS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive - Granular, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Metallic 
Color
light lead gray, dark lead gray 
Streak
grayish black 
Class
Isometric - Hexoctahedral 
Fracture
Brittle 
Hardness
2.5 
Collection
Phillips Collection
Mineralpedia
View Galena
On Dakota Matrix
Previously Sold Galena
On Dakota Matrix
Other Available Galena
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Glaucochroite

with Willemite - #DS47369
Locality
Franklin, Sussex Co., New Jersey, United States 
Formula
CaMn2+SiO4 
Availability
Sold
Size
7 x 4.5 x 4.5 cm - Sm Cabinet 
Special Info
Type Locality 

Lilac fine grained, massive Glaucochroite, with light green Willemite and Franklinite. 


Glaucochroite

Formula
CaMn2+SiO4 
Crystal System
Orthorhombic 
Crystal Habit
Granular 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
green, white, pinkish 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
Collection
Shultz Collection
Special Info
Type Locality

Hancockite

with Hendricksite - #DS47378
Locality
Franklin, Sussex Co., New Jersey, United States 
Formula
CaPbFe3+Al2(Si2O7)(SiO4)O(OH) 
Availability
Sold
Size
5 x 4 x 3 cm - Miniature 
Special Info
Type Locality 

Brick red massive Hancockite with bronzy micaceous Hendricksite. Franklin is the type locality for both minerals.


Collection
Shultz Collection
Special Info
Type Locality

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