botryoidal


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Related to botryoidal: botryoidal tissue

botryoidal

[′bä·trē‚ȯid·əl]
(science and technology)
Of formations and structures, shaped like a bunch of grapes.
References in periodicals archive ?
5-2 m high) cave structures with speleothem precipitates, such as botryoidal calcite, spar calcite, barite crystal aggregates and pyrite, are mostly found in the central and southern part of the quarry in the sub-vertical contact zones between limestone and dolomite bodies.
Fibrous minerals are commonly associated with hollow tubes in the opal, and voids occur near the remnants of the matrix or at the intersection of botryoidal domains.
Chalcedony is found as translucent gray and off-white botryoidal cavity linings and massive vein fillings; banded agate is also sometimes found.
Cerussite has also been found as large (1 cm) botryoidal coatings in rubble.
Rarely, small pyromorphite crystals are seen embedded in crusts of blue botryoidal hemimorphite and very rarely pyromorphite is found associated with small rounded mottramite crystals.
It is also found in lavender botryoidal specimens up to 2.
In these new examples the rare Pb-Al phosphate forms botryoidal coatings on earthy brown limonite, and lustrous pale green pyromorphite prisms to a few millimeters each are littered all over the gray-blue to bright baby-blue plumbogummite encrustations.
And there was a flat of miniatures consisting of loose botryoidal crusts and grapy coagulations of dark to baby-blue plancheite, with malachite pseudocrystals.
A few of the matrix pieces show areas of botryoidal green mimetite (as before) and of pearly white calcite microcrystals (as not before).
According to Panczner (1987), mimetite occurs at San Carlos as botryoidal masses associated with vanadinite and calcite; Cook(2001) writes that "fine botryoidal masses of lemon-yellow mimetite from San Carlos .
Sharp, transparent, golden orange to red-orange wulfenite crystals with red-orange botryoidal mimetite are classic specimens from the San Francisco mine, which ranks along with Los Lamentos as Mexico's greatest wulfenite locality.
It was lined with bright orange botryoidal pyromorphite aggregates grading into green crystals of classic hexagonal, hoppered shape.