Natural Prehnite Rough Stone from Namibia 75.2 gram 57x49x24 mm

Description

All natural untreated Prehnite rough stone from Namibia.
Weight: 75.2 gram
Size: 57x49x24 mm
***
Prehnite
Prehnite is a phyllosilicate of calcium and aluminium with the formula: Ca2Al(AlSi3O10)(OH)2. Limited Fe3+ substitutes for aluminium in the structure. Prehnite crystallizes in the orthorhombic crystal system. It is brittle with an uneven fracture and a vitreous to pearly lustre. Its hardness is 6-6.5, its specific gravity is 2.80-2.90 and its color varies from light green to blue or white. It is translucent.
Selltotheworld
From all around the world
Natural Prehnite Rough Stone from Namibia 75.2 gram 57x49x24 mm
All natural untreated
Prehnite rough stone
from Namibia.
Weight: 75.2 gram
Size: 57x49x24 mm
***
Prehnite
Prehnite
is a phyllosilicate of calcium and aluminium with the formula: Ca2Al(AlSi3O10)(OH)2. Limited Fe3+ substitutes for aluminium in the structure. Prehnite crystallizes in the orthorhombic crystal system. It is brittle with an uneven fracture and a vitreous to pearly lustre. Its hardness is 6-6.5, its specific gravity is 2.80-2.90 and its color varies from light green to blue or white. It is translucent.
Though not a zeolite, it is found associated with them and with datolite, calcite, etc. in veins and cavities of basaltic rocks, sometimes in granites, syenites, or gneisses. It is an indicator mineral of the prehnite-pumpellyite metamorphic facies. It was first discovered in South Africa by Colonel Hendrik Von Prehn, an early Dutch governor of the Cape of Good Hope colony. Prehnite was the first mineral to be named after a person.
Prehnite was named after its discoverer; Colonel Hendrik von Prehn and is an attractive collection mineral that is occassionally used for ornamental stone purposes. Its color is usually a pleasant green and is at times quite unique to prehnite. Typical prehnite forms rather thick crusts with a rough or crystaline texture. Epimorphs (crystal growth over the surface of another mineral) over laumonite crystals are interesting and attractive. Usually the laumontite has dissolved away leaving the hollow crust of prehnite behind.
PHYSICAL CHARACTERISTICS:
Color
is usually a pale green to a yellowish grass green, also gray, white or colorless.
Luster
is vitreous to waxy or pearly.
Transparency:
Crystals are transparent to mostly translucent.
Crystal System
is orthorhombic;
2 m m.
Crystal Habits
include nodular, concretionary, radial, encrusting and stalactitic formations among other similar types. Tabular or pyramidal individual crystals are rare but some nodular specimens show tabular crystal protrusions. Epimorphs (crystal growth over the surface of another mineral) over
laumontite
are usual, but available (see above).
Cleavage
is good in one direction (pinacoidal).
Fracture
is uneven.
Hardness
is
6 - 6.5.
Specific Gravity
is approximately
2.9+
(average).
Streak
is white.
Other Characteristics:
Lacks the luster of smithsonite and cleavage surfaces are curved and pearly.
Associated Minerals
include
datolite, gyrolite, fluorapophyllite, quartz, calcite, copper, pectolite, stilbite
and other
zeolites.
Notable Occurrences
:
South Africa, USA, India, Germany, Austria, Scotland, Namibia, Canada; China, Australia and France.
Best Field Indicators
are crystal habit, color, cleavage, hardness and associations.
Item Specifics
Natural/Lab-Created :
Natural
Brand :
Unbranded
Length :
57
Width :
49
Depth :
24
Total Carat Weight (TCW) :
376
Treatment :
Not Enhanced
Country of Origin :
Namibia
Transparency :
Translucent
Cut Grade :
Good
Modified Item :
No
Country/Region of Manufacture :
Namibia
Payment
By Paypal
Shipping
Free shipping cost.
We send the goods to USA, Canada, UK, Australia, New Zealand, EU countries and some other European and Asian countries by E-express, a kind of fast postal service by Hong Kong Post. It usually takes about 6 to 10 working days for delivery.
We send the goods to other countries by registered airmail and will take about 8 to 14 working days for delivery.
Returns
Returns: We accept returns with any reason in 30 days.
Contact Us
We will answer buyer messages within 24 hours during working days.
Selltotheworld
From all around the world
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Natural Prehnite Rough Stone from Namibia 75.2 gram 57x49x24 mm
All natural untreated
Prehnite rough stone
from Namibia.
Weight: 75.2 gram
Size: 57x49x24 mm
***
Prehnite
Prehnite
is a phyllosilicate of calcium and aluminium with the formula: Ca2Al(AlSi3O10)(OH)2. Limited Fe3+ substitutes for aluminium in the structure. Prehnite crystallizes in the orthorhombic crystal system. It is brittle with an uneven fracture and a vitreous to pearly lustre. Its hardness is 6-6.5, its specific gravity is 2.80-2.90 and its color varies from light green to blue or white. It is translucent.
Though not a zeolite, it is found associated with them and with datolite, calcite, etc. in veins and cavities of basaltic rocks, sometimes in granites, syenites, or gneisses. It is an indicator mineral of the prehnite-pumpellyite metamorphic facies. It was first discovered in South Africa by Colonel Hendrik Von Prehn, an early Dutch governor of the Cape of Good Hope colony. Prehnite was the first mineral to be named after a person.
Prehnite was named after its discoverer; Colonel Hendrik von Prehn and is an attractive collection mineral that is occassionally used for ornamental stone purposes. Its color is usually a pleasant green and is at times quite unique to prehnite. Typical prehnite forms rather thick crusts with a rough or crystaline texture. Epimorphs (crystal growth over the surface of another mineral) over laumonite crystals are interesting and attractive. Usually the laumontite has dissolved away leaving the hollow crust of prehnite behind.
PHYSICAL CHARACTERISTICS:
Color
is usually a pale green to a yellowish grass green, also gray, white or colorless.
Luster
is vitreous to waxy or pearly.
Transparency:
Crystals are transparent to mostly translucent.
Crystal System
is orthorhombic;
2 m m.
Crystal Habits
include nodular, concretionary, radial, encrusting and stalactitic formations among other similar types. Tabular or pyramidal individual crystals are rare but some nodular specimens show tabular crystal protrusions. Epimorphs (crystal growth over the surface of another mineral) over
laumontite
are usual, but available (see above).
Cleavage
is good in one direction (pinacoidal).
Fracture
is uneven.
Hardness
is
6 - 6.5.
Specific Gravity
is approximately
2.9+
(average).
Streak
is white.
Other Characteristics:
Lacks the luster of smithsonite and cleavage surfaces are curved and pearly.
Associated Minerals
include
datolite, gyrolite, fluorapophyllite, quartz, calcite, copper, pectolite, stilbite
and other
zeolites.
Notable Occurrences
:
South Africa, USA, India, Germany, Austria, Scotland, Namibia, Canada; China, Australia and France.
Best Field Indicators
are crystal habit, color, cleavage, hardness and associations.
Item Specifics
Natural/Lab-Created :
Natural
Brand :
Unbranded
Length :
57
Width :
49
Depth :
24
Total Carat Weight (TCW) :
376
Treatment :
Not Enhanced
Country of Origin :
Namibia
Transparency :
Translucent
Cut Grade :
Good
Modified Item :
No
Country/Region of Manufacture :
Namibia
Payment
By Paypal
Shipping
Free shipping cost.
We send the goods to USA, Canada, UK, Australia, New Zealand, EU countries and some other European and Asian countries by E-express, a kind of fast postal service by Hong Kong Post. It usually takes about 6 to 10 working days for delivery.
We send the goods to other countries by registered airmail and will take about 8 to 14 working days for delivery.
Returns
Returns: We accept returns with any reason in 30 days.
Contact Us
We will answer buyer messages within 24 hours during working days.
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