Natural Prehnite Rough Stone from Namibia 15 to 50 gram size 150 gram Lot

Description

All natural untreated Prehnite rough stones from Namibia.
15 to 50 gram in size each piece
Weight: 150 gram  (0.33 pound = 5.3 ounce)
About 3 to 7 pieces in one lot.
Stones will be pick from the bulk bag randomly and may be from 25 to 40 pieces in each kg depends on size of each piece
Size: 21x27x32 mm to 27x38x47 mm(0.8x1.1x1.3 inch to 1.1x1.5x1.9 inch) each piece
The pictures in the listing are just for reference as we are selling multiple pieces with same pictures.
***
Prehnite
Allaboutlearning
Your best online business partner
Natural Prehnite Rough Stone from Namibia 15 to 50 gram size 150 gram Lot
All natural untreated
Prehnite rough stones
from Namibia.
15 to 50 gram in size each piece
Weight: 150 gram  (0.33 pound = 5.3 ounce)
About 3 to 7 pieces in one lot.
Stones will be pick from the bulk bag randomly and may be from 25 to 40 pieces in each kg depends on size of each piece
Size: 21x27x32 mm to 27x38x47 mm(0.8x1.1x1.3 inch to 1.1x1.5x1.9 inch) each piece
The pictures in the listing are just for reference as we are selling multiple pieces with same pictures.
***
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
Color
Green
Treatment
Not Enhanced
Brand
Unbranded
Country of Manufacture
Namibia
Gemstone
Prenite
Transparency
Translucent
Cut Grade
Good
Natural/Lab-Created
Natural
Country of Origin
Namibia
Total Carat Weight (TCW)
750
Modified Item
No
Country/Region of Manufacture
Namibia
Payment
Payment: By Paypal
Shipping cost
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.
Return policy
Returns: We accept returns with any reason in 30 days. Buyer will bear the return shipping cost.
Messages
We will answer messages in 24 hours during working days.
[ Policy
: This is the contents of your policies. You can add a banner for this policy as header and add text descriptions here. The text descriptions can be different Font Size, Font Color, Style and even graphics and icons are also accepted. ]
Allaboutlearning
Your best online business partner
Natural Prehnite Rough Stone from Namibia 15 to 50 gram size 150 gram Lot
All natural untreated
Prehnite rough stones
from Namibia.
15 to 50 gram in size each piece
Weight: 150 gram  (0.33 pound = 5.3 ounce)
About 3 to 7 pieces in one lot.
Stones will be pick from the bulk bag randomly and may be from 25 to 40 pieces in each kg depends on size of each piece
Size: 21x27x32 mm to 27x38x47 mm(0.8x1.1x1.3 inch to 1.1x1.5x1.9 inch) each piece
The pictures in the listing are just for reference as we are selling multiple pieces with same pictures.
***
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
Color :
Green
Treatment :
Not Enhanced
Brand :
Unbranded
Country of Manufacture :
Namibia
Gemstone :
Prenite
Transparency :
Translucent
Cut Grade :
Good
Natural/Lab-Created :
Natural
Country of Origin :
Namibia
Total Carat Weight (TCW) :
750
Modified Item :
No
Country/Region of Manufacture :
Namibia
Payment
Payment: By Paypal
Shipping cost
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.
Return policy
Returns: We accept returns with any reason in 30 days. Buyer will bear the return shipping cost.
Messages
We will answer messages in 24 hours during working days.
[ Policy
: This is the contents of your policies. You can add a banner for this policy as header and add text descriptions here. The text descriptions can be different Font Size, Font Color, Style and even graphics and icons are also accepted. ]
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