The best crystals of leucosphenite are probably those from MSH. It is a firly rare mineral here, found almost exclusively in the igneous breccia cavities. But this specimen is from a marble xenolith, which is an extremely rare occurrence.

The first pair of photos (FOV 3.8 x 2.3 mm) is a “top” view of the leucosphenite. Top to bottom, the leucosphenite spans 3.2 mm. The small dark crystals are (probably) magnesio-arfvedsonite. They are well terminated, and some have a beautiful deep “bottle green” color.

The second pair of photos (FOV 4.2 x 6.7 mm) is a “side” view of the pale blue leucosphenite (at top) as well as a well-terminated colorless pectolite crystal. In this view, the leucosphenite spans 3.1 x 3.1 mm. The pectolite crystal is 2.6 mm tall. (The leucophanite crystals are striated; the pectolite crystal is not.)

The third pair of photos (FOV 3.7 x 2.4 mm) shows the other “side” of the leucosphenite and the termination on the pectolite cryral.

The fourth pair of photos is a close-up (FOV 2.2 x 3.3 mm) of some of the magnesio-arfvedsonite crystals on the specimen. They are almost all <= 0.5 mm in length. (See the "Analysis" tab.)

The specimen is a large micro. It could probably be trimmed to “true” micro size without damaging the leucospenite. But you would lose some of the pectolite and magnesio-arfvedsonte crystals. More importantly, you would lose the distinctive matrix that clearly shows that this specimen is from marble xenolith, rather than the much more common igneous breccia.

Single item shipping weight 4.0 oz (112 g). Outside the USA, the stated postage and packing rate applies up to a total weight of 8 oz (225 g).

Within the USA, there is a nominal increase of $0.20 for each additional ounce. Above 13 oz, I will use Priority Mail. Up to 16 oz, the “own box” Priority rate is $9.25 (including packing).