Natural Prehnite Rough Stone from Namibia over 200 gram large size 0.7 kg Lot

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Seller: selltotheworld ✉️ (2,464) 99.2%, Location: Hong Kong, HK, Ships to: AMERICAS, EUROPE, ASIA, AU, Item: 153137339985 Natural Prehnite Rough Stone from Namibia over 200 gram large size 0.7 kg Lot.
  • All natural untreated Prehnite rough stones from Namibia.
  •  
  • Weight: 700 gram  (1.54 pound = 24.7 ounce)
  •  
  • Stones will be pick from the bulk bag randomly and may be from 2 to 3 pieces in each kg depends on size of each piece
  •  
  • Weight: over 200 gram each piece (up to 550 gram a piece)
  • Size: 90x60x40 mm to 130x95x45 mm(3.5x2.4x1.6 inch to 4.7x3.7x1.8 inch) each piece
  •  
  • The pictures in the listing are just for reference as we are selling multiple pieces with same picture.
  •  
  • ***
  • Prehnite

    Selltotheworld

    From all around the world

    Natural Prehnite Rough Stone from Namibia over 200 gram large size 0.7 kg Lot

    All natural untreated Prehnite rough stones from Namibia.

     

    Weight: 700 gram  (1.54 pound = 24.7 ounce)

     

    Stones will be pick from the bulk bag randomly and may be from 2 to 3 pieces in each kg depends on size of each piece

     

    Weight: over 200 gram each piece (up to 550 gram a piece)

    Size: 90x60x40 mm to 130x95x45 mm(3.5x2.4x1.6 inch to 4.7x3.7x1.8 inch) each piece

     

    The pictures in the listing are just for reference as we are selling multiple pieces with same picture.

     

    ***

    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
    Transparency : Opaque
    Brand : Unbranded
    Treatment : None (No Enhancement)
    Cut Grade : Good
    Country of Origin : Namibia
    Country/Region of Manufacture : Namibia
    Gemstone Type : Prehnite
    Gemstone Color : Green
    Gemstone Creation : Natural
    Gemstone Form : Rough
    Gemstone Treatment : Not Enhanced
    Gemstone Clarity Grade : Eye Clean
    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

    DESCRIPTION PAYMENT SHIPPING RETURN POLICY CONTACT US
    Natural Prehnite Rough Stone from Namibia over 200 gram large size 0.7 kg Lot

    All natural untreated Prehnite rough stones from Namibia.

     

    Weight: 700 gram  (1.54 pound = 24.7 ounce)

     

    Stones will be pick from the bulk bag randomly and may be from 2 to 3 pieces in each kg depends on size of each piece

     

    Weight: over 200 gram each piece (up to 550 gram a piece)

    Size: 90x60x40 mm to 130x95x45 mm(3.5x2.4x1.6 inch to 4.7x3.7x1.8 inch) each piece

     

    The pictures in the listing are just for reference as we are selling multiple pieces with same picture.

     

    ***

    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
    Transparency : Opaque
    Brand : Unbranded
    Treatment : None (No Enhancement)
    Cut Grade : Good
    Country of Origin : Namibia
    Country/Region of Manufacture : Namibia
    Gemstone Type : Prehnite
    Gemstone Color : Green
    Gemstone Creation : Natural
    Gemstone Form : Rough
    Gemstone Treatment : Not Enhanced
    Gemstone Clarity Grade : Eye Clean
    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.

    All right reserved.

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    Custom Item
    • Condition: New with tags
    • Gemstone Shape: Rough
    • Certification: NA
    • Wholesale: No
    • Gemstone Creation: Natural
    • Item Width: NA
    • Gemstone Color: Green
    • Number of Pieces: NA
    • Item Length: NA
    • Cut Grade: Good
    • Gemstone Clarity Grade: Eye Clean
    • Country/Region of Manufacture: Namibia
    • Transparency: Opaque
    • Gemstone Type: Prehnite
    • Gemstone Form: Rough
    • Treatment: None (No Enhancement)
    • Gemstone Effect: Iridescence
    • Gemstone Treatment: Not Enhanced
    • Brand: Unbranded
    • Country of Origin: Namibia
    • Item Depth: NA
  • PicClick Insights - Natural Prehnite Rough Stone from Namibia over 200 gram large size 0.7 kg Lot PicClick Exclusive

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