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Prehnite with epidote polished towerApprox height: A 3. 5" sits wobbly! B 4" a bit precarious due to hollow base! C 3. 75" D 3. 5" E 3. 5" Alternately called points or obelisks, these towers are cut and polished from botryoidal prehnite pierced with dark needles of epidote. I prefer to pick towers with open cavities that reveal the mineral structure, and these points have excellent raw (natural, unpolished) edges and openings revealing the botryoidal prehnite formations. Prehnite and

The inclusions can make the garden quartz appear dark

this piece has a disc-like botryoidal quartz formation on one calcite crystal

but this creates an interesting effect

The crystal tops have intricate growth patterns across the surface

with good symmetry and straight edges

This calcite specimen from Santa Eulalia has a layer of calcite druzy with several larger modified rhombohedral calcite crystals perched atop

UV reactivity white chalcedony gives a light white fluorescent reaction under 365 nm UV light

The glossy schorl crystals grow in short prisms with the classic trigonal 'Mercedes' termination characteristic of Erongo material

This material is brittle and may shed pieces

This thing really shows off in a light box (please someone professional at mineral photography buy this)

It can grow blocky points like the larger crystal in this pair

indicating a shift in position of the mineral and a second generation of stalactitic growth