> 300 Minerals with unknown
crystal structure (probably)
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Many of these minerals are obviously candidates for a SDPD
(Structure Determination by Powder Diffractometry), although some will
not, due to low crystallinity degree, or amorphous state... Some may belong
to already known groups and their structure needs only to be refined.
-
Most of them are showing unfavorable habits (crust-like, aggregates,
microcrystalline, fibers, systematically twinned, etc) for a classical
structure determination from a single crystal mounted on a four-circle
diffractometer.
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For learning more about them, use their name as a keyword with Google,
you will then probably go to Webmineral
or
ENSMP
pages for more information. You may obtain them from mineral vendors or
rock exchange meetings (small pieces may be enough - micromounts, for low
cost - a few US$). The main problem is to isolate a sufficiently large
sample of pure phase (200 to 500 mg should be enough for a structure determination,
and a minimum of 50 mg will be sufficient for a phase identification by
powder diffraction with a search-match software and the PDF-2
database). Note also that CCD techniques have decreased the minimum
size for a manageable single crystal, and that single crystal technique
is always better than powder technique, when feasible.
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Please send info about other minerals
having unknown structure.
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Learn how to determine a crystal structure from powder diffraction data
by a distance learning course.
-
See also the list of minerals
with known crystal structure.
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The following means that the structure was just determined : too
late. For more about (a)
write to Dr. Uwe Kolitsch.
-
Sometimes is given a sample photo (link from the
name) and the identification by a search-match program (.gif), as well
as the full X-ray powder diffraction diagram (.dat).
Last update - July 30, 2001 - Armel
Le Bail
Ajoite - too late (a)
Aldermanite
Aliettite
Alumotungstite
Anthonyite
Apachite
Ardaite
Arhbarite
Arseniopleite - too late (a)
Arzrunite
Asbolane
Aspidolite
Athabascaite
Bazhenovite
Belyankinite
Benauïte - too late
Benleonardite
Beryllite
Bezsmertnovite
Bilibinskite
Blatonite
Bogdanovite
Boothite
Braitschite-(Ce)
Brindleyite (-1Q)
Brindleyite (-3R)
Cafetite - too late
Calcioursilite
Calumetite
Carbonatecyanotrichite
- the sample shown is intimately mixed with azurite (.gif)...
Hard to do something with the data (.dat)
!
Caresite (-2H)
Carrboydite
Caryopilite (-1Q)
Caryopilite (-1R)
Cervelleite
Cesarolite
Cesplumtantite
Chessexite
Chetlemanskiite
Chlorocalcite
Chugchuncite
Clinoungemachite
Cobaltzippeite
Corrensite
Cowlesite
Cuprotungstite
Cuzticite
Cyanotrichite
Danbaite
Danielsite
Denisovite
Douglasite
Duhamelite - too late
Duranusite
Dypingite
Earlandite
Ecdemite
Elyite - too late
Eugsterite
Eztlite
Fahleite
Feitknechtite
Ferrimolybdite
Ferristrunzite
Ferroåkermanite
Ferrostrunzite
Fervanite
Filipstadite
Fraipontite (-1O)
Fraipontite (-2M1)
Franconite
Franklinphilite
Fukalite
Gasparite - too late (a)
Gerasimovskite
Gilalite
Giorgiosite
Girdite
Glaucocerinite
Gonyerite (-2O)
Gormanite - too late
Gortdrumite
Goudeyite
Guarinoite
Helmutwinklerite
Hemusite
Henryite
Hisingerite
Hochelagaite
Horsfordite
Hotsonite
Hydrobasaluminite
Hydrobiotite
Hydrocerussite - too late
Hydroglauberite
Hydrohonessite (-2H)
Hydrombobomkulite
Hydroscarbroite
Hypercinnabar
Idrialite
Imogolite
Indigirite
Irhtemite
Ishikawaite
Jamborite
Janggunite
Jezekite
Joliotite
Juanite
Kamaishilite
Kankite
Karibibite
Karnasurtite-(Ce)
Karpinskite
Kellyite (-2M)
Kenyaite
Kiddcreekite
Kidwellite - too late (a)
Kingite - too late
Kittatinnyite
Kolarite
Komarovite
Koninckite
Kribergite
Kulkeite
Kurumsakite
Kutinaite
Kuzmenkoite-Fe
Kyzylkumite
Lannonite
Larosite
Laubmannite - too late (a)
Lausenite
Lavendulan - too late
Lazarenkoite
Lemmleinite-Na (-M)
Lemmleinite-Na (-O)
Lennilenapeite
Lindackerite
Loughlinite
Lourenswalsite
Luddenite
Lunijianlaite
Mcalpineite
Magadiite
Magbasite
Magnesiumzippeite
Magnioursilite
Majakite
Manganarsite
Manganbelyankinite
Manganberzellite - too late (a)
Marthozite - too late
Melanocerite-(Ce)
Meliphanite
Melkovite
Mendozavilite
Mertieite-I
Messelite - too late (a)
Meta-uranopilite
Metauranospinite (-17Å)
Meurigite
Miassite
Molybdofornacite - too late (a)
Mongolite
Mongshanite
Montroyalite
Moolooite
Mountkeithite (-7R)
Mountkeithite (-9R)
Muskoxite
Muthmannite (Ag,Au)Te [L]
Nagelschmidtite
Nakauriite
Nakomarovite
Namibite - too late
Natroniobite
Neotocite - how to identify
with certitude an amorphous compound (.gif)
? Get the .dat file and try...
The rest of the sample is goethite (.gif)
Népouite - obviously
same as pecoraite (.gif), quasi
amorphous (.dat), hard to do a
SDPD,
and hard to believe the 25-0524 and 49-1859 ICDD entries...
Nickelzippeite
Nioboaeschynite-(Nd)
Nsutite
Odinite
Oenite
Okanoganite-(Y)
Olkhonskite
Oosterboschite
Oregonite
Orickite
Orthochrysotile
Otwayite
Oursinite
Paraalumohydrocalcite
Parachrysotile
Parajamesonite
Parakuzmenkoite-Fe
Paralabuntsovite
Paralabuntsovite-Mg
Paramendozavilite
Paraumbite
Parkinsonite
Peisleyite
Pengzhizhongite-24R
Petrovskaite
Phosphofibrite
Pimelite
Pingguite
Plumbonacrite
Plumbotellurite
Polycrase-(Ce)
Polylithionite (-2M1)
Polylithionite (-3R)
Priceite - too late
Przhevalskite
Pseudo-autunite
Pushcharovskite - too late
Pyrocoproite
Rabbittite
Rabejacite
Radhakrishnaite
Ranciéite
Rankachite - too late
Ranunculite
Rectorite
Redingtonite
Rimkorolgite - too late (?]
Riversideite
Riversideite
Romanite
Sacrofanite
Sampleite - too late (a)
Sanjaunite
Saponite (-16Å)
Saponite (-17Å)
Saponite (-18Å)
Satimolite
Satpaevite
Satterlyite - too late
Sauconite (-15Å)
Sauconite (-17Å)
Scheteligite
Sedovite
Shabynite
Sharpite
Shcherbakovite - too late
Sheldrickite
Shubnikovite
Silhydrite
Simmonsite
Sinjarite
Smolianinovite
Sobotkite
Sodiumbetpakdalite
Sodium-komarovite
Sodiumzippeite
Sopcheite
Souzalite - too late
Spadaite
Stanleyite
Stepanovite
Stevensite
Strengite - too late (a)
Swaknoite
Sweetite
Symesite
Tacharanite
Taimyrite
Takanelite
Tarasovite
Tatarskite
Tatyanaite
Telargpalite
Temagamite
Ternovite
Tertschite
Theisite
Thérèsemagnanite
Thornasite
Thorosteenstrupine-(Ce)
Tlalocite
Tlapallite
Tongxinite
Tosudite
Tranquillityite
Trilithionite (-2M2)
Trimounsite - too late
Tsaregorodsevite
Tsumebite - too late (a)
Tuperssuatsiaite - too late
Tvedalite
Uranopilite - too late
Ustarasite
Vanoxite
Viaeneite
Vihorlatite
Vochtenite
Vozhminite
Vyalsovite
Wallkilldellite-(Fe)
Wallkilldellite-(Mn)
Wardsmithite
Watanabeite
Wattevillite
Wolfeite - too late (a)
Wolsendorfite
Woodruffite
Woodwardite
Wycheproofite - too late
Xocomecatlite
Yaroslavite
Yecoraite
Yttrocrasite-(Y) - too late (a)
Yttrocolumbite-(Y)
Yuksporite
Zapatalite
Zaratite
Zemkorite
Zhemchuzhnikovite
Zincaluminite
Zincrosasite
Zincsilite
Zinczippeite
Zirklerite
Zoubekite
Zykaite