Opal Freeform - Height: 7 cm - Width: 11.5 cm- 818 g - (1)
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Australian precious opal in natural host rock, a raw, irregular specimen weighing 818 g and measuring 11.5 × 7 × 7 cm.
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Description from the seller
Noble Australian opal in a natural host rock – 818 g
The auction item is a large natural block of noble Australian opal set in its host rock, distinguished by an intense blue and purple play of color.
The specimen retains a rough, irregular form, allowing observation of the opal’s natural occurrence within the rock.
Exceptional color palette
The most striking feature of the block are the extensive areas of opal with milky-blue and blue base hues.
Under light and with changes in the viewing angle, the intense play of color is visible (play-of-color), including:
electric blue,
deep blue and violet,
turquoise,
local greens and subtle pinkish reflections.
The surface shows numerous small sparkles and larger areas with varying intensity of color.
The contrast between the bright opal and the dark, brownish-gray host rock gives the specimen a particularly decorative appearance.
Natural structure
Opal forms irregular veins, fills cracks, and larger clusters that permeate the rock.
In some places thicker, light-toned opal portions with a glassy or waxy luster are visible; in others—thin layers revealing intense iridescence.
The block has not been shaped into a sculpture nor cut into a jewelry stone. It preserves the character of a natural mineralogical specimen.
Specimen data
Mineral: precious opal
Form: opal in natural host rock
Origin: Australia
Dimensions: 11.5 × 7 × 7 cm
Total weight: 818 g
Color: milky light blue, blue, violet, turquoise, with green reflections
Form: raw collector’s specimen
The stated weight includes both opal and the surrounding rock.
Collector value
The specimen is notable for its large size, substantial visible opal area, and intense blue play of color.
It is interesting both as a decorative mineral for a collection and as an example of natural Australian opal occurring in rock.
Detailed photographs show the block from different sides and close-ups of ophal structures and color effects.
Condition
The block is preserved in its natural, rough form, with surface irregularities, cracks, and fragments of host rock.
The condition and structure of the specimen are shown in detail in the photographs.
From a private collection
The specimen comes from my private mineral collection.
I am selling part of the collections to raise funds for repairing a home damaged by the 2024 flood.
The item will be carefully prepared for transport, with particular attention to the natural opal portions and delicate rock edges.
Noble Australian opal in a natural host rock – 818 g
The auction item is a large natural block of noble Australian opal set in its host rock, distinguished by an intense blue and purple play of color.
The specimen retains a rough, irregular form, allowing observation of the opal’s natural occurrence within the rock.
Exceptional color palette
The most striking feature of the block are the extensive areas of opal with milky-blue and blue base hues.
Under light and with changes in the viewing angle, the intense play of color is visible (play-of-color), including:
electric blue,
deep blue and violet,
turquoise,
local greens and subtle pinkish reflections.
The surface shows numerous small sparkles and larger areas with varying intensity of color.
The contrast between the bright opal and the dark, brownish-gray host rock gives the specimen a particularly decorative appearance.
Natural structure
Opal forms irregular veins, fills cracks, and larger clusters that permeate the rock.
In some places thicker, light-toned opal portions with a glassy or waxy luster are visible; in others—thin layers revealing intense iridescence.
The block has not been shaped into a sculpture nor cut into a jewelry stone. It preserves the character of a natural mineralogical specimen.
Specimen data
Mineral: precious opal
Form: opal in natural host rock
Origin: Australia
Dimensions: 11.5 × 7 × 7 cm
Total weight: 818 g
Color: milky light blue, blue, violet, turquoise, with green reflections
Form: raw collector’s specimen
The stated weight includes both opal and the surrounding rock.
Collector value
The specimen is notable for its large size, substantial visible opal area, and intense blue play of color.
It is interesting both as a decorative mineral for a collection and as an example of natural Australian opal occurring in rock.
Detailed photographs show the block from different sides and close-ups of ophal structures and color effects.
Condition
The block is preserved in its natural, rough form, with surface irregularities, cracks, and fragments of host rock.
The condition and structure of the specimen are shown in detail in the photographs.
From a private collection
The specimen comes from my private mineral collection.
I am selling part of the collections to raise funds for repairing a home damaged by the 2024 flood.
The item will be carefully prepared for transport, with particular attention to the natural opal portions and delicate rock edges.
Details
Number of objects
1
Main mineral
Opal
Mineral form
Freeform
Weight
818 g
Country of origin
Australia
Height
7 cm
Width
11.5 cm
Depth
7 cm
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