Search Archived Mineral Specimens
- Availability
- Sold
- Locality
- Drain, Douglas Co., Oregon, United States
- Formula
- Ca(Si4Al2)O12·4H2O
- Size
- SmCabinet 7x6x3cm
White sharp crystals of Laumontite to 1.3cm. Excellent specimen.
- Availability
- Sold
- Locality
- Crastu Muradu, Osilo, Sassari, Sardinia, Italy
- Formula
- Ca(Si4Al2)O12·4H2O
- Size
- SmCabinet 6.5x4x4.5cm
Beautiful radiating groups of Laumontite measuring 8mm at the largest. There are five good sprays.
- Availability
- Sold
- Locality
- Pine Creek mine, Scheelite, Bishop dist., Inyo Co., California, United States
- Formula
- Ca(Si4Al2)O12·4H2O
- Size
- SmCabinet 7x3.5x3.5cm
Yellowish brown prismatitc crystals of Laumontite. The longest crystal mesaures 7.5cm, while the other is 5.5cm. It is a sweet specimen with shows good "fishtail" twinning as seen in the second photo. Very good specimen.
- Availability
- Sold
- Locality
- Grand Reef mine, Graham Co., Arizona, United States
- Formula
- Pb7F12Cl2
- Size
- SmCabinet 6x4x3cm
- Special Info
- Type Locality
An excellent, very rich specimen of this rare fluoro-oxyhalide of lead from the type locality. It is only found in two other confirmed localites. This is by far the best locality.
On this specimen are thick, snow white, silky crystals in vein fillings 1.5cm long. The best area is that of the second photo which is on the side and is 6x4mm. Each occurence is lined by light purple amethyst and outward to Galena.
- Availability
- Sold
- Locality
- Grand Reef mine, Graham Co., Arizona, United States
- Formula
- Pb7F12Cl2
- Size
- Miniature 4.5x3.5x4cm
White acicular crystals to 2mm in Galena vug.
- Availability
- Sold
- Locality
- Grand Reef mine, Graham Co., Arizona, United States
- Formula
- Pb7F12Cl2
- Size
- SmCabinet 6x6x4cm
- Special Info
- Type Locality
- Special Info
- XRD Confirmed
Large, silky-white to colorless compact fibrous or prismatic crystal groups of Laurelite. There are many more crystals than those photographed. Usually Laurelite crystals are microscopic acicular crystals occuring in bundles. These crystals are therefore untypically large and unsual in habit. They were verified by XRD. There are also the more trypical tiny acicular habit Laurelite crystals on the matrix.
The specimen as a whole is mineralogically a very interesting specimen which shows the paragenesis of the minerals produced. Unknown are the yellowish clusters which are somewhat pearly and flaky and very soft. The crystals are too small to XRD (I tried), but I don't know what EDS would show given the composition of these oxyhalides. Most of the colorless, equant crystals lining the cavity are Anglesite. The exterior wall contains a black oxide with a sooty overgrowth. There is also Caledonite and what seems to Boleite, although it is not reported at the Grand Reef.
Whoever is the lucky next owner of this specimen will have to do some work on the yellowish cluster as well as the secondary minerals along the exterior. May be some new minerals on this specimen.
