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Goosecreekite
Current inventory:  0 gems
 

  
Goosecreekite is named for the type locality, the New Goose Creek Quarry (Luck Company Quarry), Leesburg, Loudoun County, Virginia, USA.

Discovered in 1980;   IMA status: Valid (IMA approved).

Chemistry

Chemical Formula:

CaAl₂Si₆O₁₆ · 5(H₂O)

Hydrated Calcium Aluminum Silicate

Molecular Weight:

608.62 gm

Composition: 

Classification

Mineral Classification:

Silicates (Germanates)

Strunz 8th Ed. ID:

8/J.23-60

Nickel-Strunz 10th Ed. ID:

9.GB.25 

9.GB.25
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H₂O; zeolite family
B : Chains of single connected 4-membered rings

Related to:

Zeolite Group. Heulandite - Barium-Brewsterite Series. Dimorphous with Epistilbite.

Crystal Data

Crystallography:

Monoclinic - Sphenoidal

Crystal Habit:

As equant euhedral crystals, highly curved, to 4 cm; in polycrystalline aggregates.

Twinning:

None

Physical Properties

Cleavage:

[010] Perfect

Fracture:

Irregular/Uneven

Tenacity:

Brittle

Moh's Hardness:

4.5

Density:

2.21 (g/cm³)

Luminescence:

None

Radioactivity:

Not Radioactive

Optical Properties

Color:

Colorless, White

Transparency:

Transparent

Luster:

Vitreous to Pearly on crystal faces

Refractive Index:

1.495 - 1.502  Biaxial ( - )

Birefringence:

0.007

Dispersion:

Relatively Weak

Pleochroism:

None

Occurances

Geological Setting:

A late-stage mineral in vugs and fractures in a Triassic diabase (Goose Creek Quarry, Virginia, USA); in cavities in basalt (Nasik, India).

Common Associations:

Actinolite, Albite, Apophyllite, Babingtonite, Chlorite, Epidote, Prehnite, Quartz, Stilbite, Titanite (Goose Creek quarry, Virginia, USA); Quartz (Nasik, India).

Type Locality:

New Goose Creek Quarry (Luck Company Quarry), Leesburg, Loudoun Co., Virginia, USA

Year Discovered:

1980

View mineral photos:

Goosecreekite Mineral Photos and Locations

More Information

Mindat.org
Webmineral.com

Goosecreekite is one of the rarest of the Zeolite Group of minerals that includes over 40 minerals and these gem-type minerals: Analcime, Barrerite, Chabazite, Epistilbite, Gmelinite-Na, Goosecreekite, Mordenite, Natrolite, Pollucite, Scolecite, Stellerite, Stilbite, Thomsonite and Yugawaralite. Goosecreekite is one of the most unusually named minerals. It is named after the New Goose Creek Quarry in Loudoun County, Virginia, USA. Goosecreekite is found in the vesicles or bubbles of volcanic rock as are most other Zeolites. Goosecreekite is a very rare mineral and extremely rare as a faceted gem.

Goosecreekite is found in only three locations: the type locality at the New Goose Creek Quarry, Leesburg, Loudoun County, Virginia, USA; exceptional crystals are found at the Pandulena Quarry, Nasik, Maharashtra, India; and the OberbaumÄuhle Quarry, Windischeschenbach, Bavaria, Germany.
 

  
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