Unusually sharp and transparent crystals of Prehnite in an esthetic cluster. The crystals are in fine undamaged condition and this specimen has a lot of display impact. The Jeffrey mine is famed for its Garnets and Vesuvianite but the Prehnites found here were world class and of incredible variety. This is an excellent example showing the elongated blocky form with a delicate light green hue. Even though Prehnite is not a rare mineral and is found worldwide, good sharp crystals are rare and these from the Jeffrey are unique. Not found for some years, these are modern classics and no others from elsewhere have this look and habit.
Prehnite -well crystalized
Merelani, Umba Valley, Lelatama Mountains, Arusha Region
5.7 x 3.9 x 3.2 CM (cabinet)
Radiating cluster of fine terminated Prehnite crystals from the famed Merelani Hills best known for its Tanzanite. In fine condition by naked eye, some very minor bruising is seen with magnification, but overall the visual impression is pristine. This is also a color-changing Prehnite and can look green to a gray-blue depending on the light source. Some of the crystals also show slight rotation or twisting like some of the classic European Alpine specimens.
A cluster of Prehnite crystals are almost completely covered with tiny colorless and white Grossular crystals. There are a few small areas of uncovered Prehnite where it can be seen that these are glassy and transparent. Colorless or white Garnet is very rare and the tiny Grossular here are nearly all transparent, mostly colorless with a few white translucent crystals. It is impossible to find this combination available unless from an oldcollections being dispursed.
Prehnite -elongated crystals
Jeffrey Mine, Asbestos
3.9 x 3 x 1.8 CM (small miniature/ large thumbnail (toenail))
Late Summer 2018
The amazing Prehnite crystals from Jeffrey mine took many forms and habits, unlike anything ever seen elsewhere. Although Prehnite is not really a scarce mineral, sizable prismatic Prehnite crystals are incredibly rare. This prismatic Prehnite cluster is a good example, sharp, with some complete doubly terminated crystals to 3.8 CM long. The luster is pearly and the crystal tips are transparent, the body is more milky translucent. There is chipping only on the outer edges, the center area is pristine and undamaged. A good small miniature showing an elongated habit, wide center sections and with square cross section terminations.
Prehnite crystals -Vintage Swiss
Muotta Naira, Piz Lai BlauNalps Valley, Tujetsch, Vorderrhein
11.3 x 6.4 x 2.6 CM (cabinet)
A matrix plate with clear light green Prehnite crystals to 1.4 CM scattered with smaller Prehnites and some tiny Epidote and Byssolite. Classic specimen, ex Charles Noll collection and a much older label from an unknown collection. In fine condition overall, the main crystals are pristine. Some crystals are also on the underside but the view shown is the logical display face.
A pair of well formed, isolated Prehnite crystals are nicely perched on a matrix of slender Diopside crystals. Excellent contrast and an unusual combination that is very esthetic. The display face of fully crystalized and fully damage free, which is remarkable with delicate Diopsides. Jeffrey mine has over the years produced the best Prehnite crystals in the world in many habits and colors. This miniature is remarkable for the perfection of form, a super Prehnite specimen from anyplace and quite fine even among good Jeffrey pieces.
Prehnite on Quartz
Goboboseb Mts., Brandberg area,
9.7 x 7.7 x 4.3 CM (cabinet)
Pre Holiday 2017
Balls of crystallized Prehnite (up to 2.5 CM) in perfect condition are set on a matrix of Quartz crystals. A few Quartz crystals have breaks but most are undamaged. From the Goboboseb mountains better known for their great Amethysts, this is a bright, colorful and lustrous piece in person.
A large, sharp, very pale green single crystal of Prehnite in blocky form. From the Jeffrey Mine, where some of the worlds best and largest Prehnite crystals were found. No damage and with good luster this is a nice thumbnail that shows the habit well. Prehnite is a rather common mineral but crystals over a half centimeter are very rare and only come from a few finds.