The Itrongay region of Madagascar has produced the finest gem crystals of Orthoclase. This miniature is VERY RARE AND LARGE for the fine condition it is in, only being cleaved at the bottom where contacted. The crystal is 100% gem, golden, totally transparent, with many of the crystal faces present. The faces are glassy and textured with small, curvy trenches that look like subparallel and tiny worm tracks. This gem Orthoclase's mass is 61 grams. Specimen of this quality for both gemminess and luster WITH a good form at the same time, are quite uncommon although they have trickled out slowly for years.
A few, minute (0.2mm), gemmy, isolated, hexagonal crystals of bazzite (scandium analogue of beryl) and a single, parallel growth cluster, all with a rich light blue color in small miaroles within a granite matrix accompanied by brownish green aeschynite-(Y); colorless, transparent to translucent, bertrandite; silver-gray muscovite; and albite plates. Ex. Paulo Matioli collection.
A rare locality piece from historic collecting in this location and part of Ernie Schlicter's alpine suite. This is a superb, lustrous single crystal, complete all around except only a small contact to matrix in the lower back. I bought this and some other pieces in this update from the collection of Ernie Schlicter back around 2007, before the whole collection was sold, and held it till now.
This is from a rare and highly desirable locality, with unique and distinct style. Two, pastel pink, gemmy, heavily modified fluorite crystals to 1.5 cm across are aesthetically perched on lustrous, sugary adularia, a variety of orthoclase. Although not as deeply colored as some of its alpine cousins, the transparency and complexity of the crystals is absolutely superb. This pocket, or this style rather from this region, is notable for its difference from the common sort of Alpine fluorite. I have seen such pieces at Munich for twice the price, in Euros yet, as they seem overly valued to me in the European market.
Vizze Valley (Pfitsch Valley), Bolzano Province (South Tyrol), Trentino-Alto Adige, Italy
Cabinet, 10.1 x 9.5 x 6.0 cm
This is a classic alpine style specimen: a large, fist-sized cluster of gemmy, translucent orthoclase feldspar crystals. The cluster is a floater, complete all around. It is unusually pristine and sharp, and very 3-dimensional in person. The photos show it in normal frontal lighting, though it has a better "glow" to it when backlit. Impressive, in person! From the collection of Hubert De Monmonier (1919-2007), donated by bequest to the University of Arizona Museum to add to their displays and to provide specimens for sale to establish an endowment fund for museum operations, in perpetuity.
Thumbnail – Maximum 3.0 cm
Toenail – A “gut feeling” but often overlaps between a large thumbnail and a small miniature
Miniature – Maximum 5.0 cm
Small Cabinet – Maximum 9.4 cm
Cabinet – Maximum 18.0 cm
Large Cabinet – Over 18.0 cm
Using the Search Form
All specimens for sale on the web site are entered into a
database. The search form allows you to specify criterea
to select the specimens you wish to view.
The form has a set of fields for you to fill in. You may fill in one
or more of the fields. If you fill in more than one, then only
specimens satisfying all fields will be returned. (Empty
fields match all specimens).
For the type-in text fields, the value you type in is matched
against the values in the field for each specimen in the database.
Since it's a pattern match, it's ok to type in partial
values. For example, when searching localities, if you simply
enter "China", you'll select all speciments from anywhere in
China. If you type in "Colorado, USA", you'll get all
specimens from the state of Colorado in the United States.
You can limit the search to specimens that were added during
some interval or prior to that interval. For example, selecting
"Before" and "10 Days" will search specimens added prior to the
last 10 days. Selecting "Since" and "10 Days" will search specimens
added during the last 10 days.
Each specimen has a unique alphanumeric ID, for example,
"CK42", or "URI-01". You can limit the search for specimens whose IDs contain a given
string of characters by specifying it here. You can indicate if
you would like "Partial Matches". For example "K-112" would match
"K-112" and "HECK-112". Or you can uncheck the "Partial Matches"
box to only retrieve exact matches.
Each specimen has a name field. Often the name is just the name
of the primary mineral(s) of the specimen. But in some cases,
there are conventions that can be useful in finding what you are
looking for. For example, all pseudomorph specimens will
the string "after" in their names, so you can find all pseudomorphs
by entering "after" in the Name field. Be aware that the name
field might include variety names ("amethyst", "aquamarine", etc.).
Thus, to be sure of finding all Beryl specimens, select Beryl in the
Mineral field - not in the Name field.
The Species field is different from the Name field, in that it searches
the list of species occurances noted for each specimen. (Not the
species names that happen to be in the specimen name!) It is more
precise than searching for species names in the Name field. For
example, if you search for just "A" in the Name field, you will find
Albites, Amazonites, Azurites, and so on... if you search for
specimens by specifying a Species in the Species
drop-down menu, the only specimens noting a occurance of that species
will be selected. The Species field allows IMA-approved species names,
only. (E.g., you'll find Quartz, but not Amethyst).
The locality field is populated with locality names. Spellings and the
locality hierarchy are generally as presented in the locality listings
Of course, you can also search by any part of the locality name,
for example, "Sweet Home Mine" would find all specimens from a
The Description field seaches in the specimen descriptions.
Since previous owners are usually named in the description,
you can search for "Arthur Montgomery" to look for specimens
sold by the noted American mineralogist (or perhaps even from
Montgomery's personal collection).
Allows you to search based on the specimen sizes.
By filling in these fields, you can limit the search to a particular
price range. For example, with "Min Price" 1000 and "Max Price" of 2000,
the search will only match specimens in this price range.
Allows you to constrain the search to specimens formerly in the collection
of one of the listed collectors or institutions.
Searches are "bookmarkable". After clicking "Search", and
receiving results, you can bookmark the result page, and
your bookmark will store the search. Remember, revisiting the
bookmark will re-execute the search; it does not store
the search results. If the contents of the database have changed
since the search was originally stored, the results
THE ARKENSTONE has been a leading crystal and fine mineral specimen dealer with a variety of common and rare minerals for sale online and in our galleries in Dallas, Texas and Shanghai, China. Visit iRocks.com to learn about fine minerals and explore natural fine mineral specimens, crystals, and gemstones. Get in touch to schedule a private gallery visit or ask how to sell mineral collections.
PO Box 830460 | Richardson, TX 75083 | (972) 437-2492 | info@iRocks.com