Tumbled Prehnite Stone 2 to12 gram size pieces 200 gram Lot

Description

Well tumbled all natural untreated Prehnite stones from Namibia.
- 0.2 Kg Lot (0.44 pound)
Weight per piece: 2 to 12 gram
Sizes:  14x11x9 mm to 22x21x18 mm
Quantity: about 25 to 45 pieces in each lot
The pictures in the listing are just for reference as we are selling multiple lots with same pictures.
***
Prehnite
Nature & Science
Tumbled Prehnite Stone 2 to12 gram size pieces 200 gram Lot
Well tumbled a
ll natural untreated
Prehnite stones
from Namibia.
-
0.2 Kg Lot
(0.44 pound)
Weight per piece: 2 to 12 gram
Sizes:  14x11x9 mm to 22x21x18 mm
Quantity: about 25 to 45 pieces in each lot
The pictures in
the
listing
are
just for reference as we are selling multiple
lots
with same pictures.
***
P
rehnite
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
Brand
Unbranded
Treatment
Not Enhanced
Transparency
Opaque
Cut Grade
Good
Country of Origin
Namibia
Country/Region of Manufacture
China
UPC
Does Not Apply
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.
Messages
We will answer buyer messages within 24 hours during working days.
Nature & Science
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Picture
Custom Item
Tumbled Prehnite Stone 2 to12 gram size pieces 200 gram Lot
Well tumbled a
ll natural untreated
Prehnite stones
from Namibia.
-
0.2 Kg Lot
(0.44 pound)
Weight per piece: 2 to 12 gram
Sizes:  14x11x9 mm to 22x21x18 mm
Quantity: about 25 to 45 pieces in each lot
The pictures in
the
listing
are
just for reference as we are selling multiple
lots
with same pictures.
***
P
rehnite
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.
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.
Messages
We will answer buyer messages within 24 hours during working days.
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