In the Kalana quarry cryptocrystalline
to argillaceous limestones with skeletal grainstone lenses and intercalations of the Raikkula Stage (Fig.
The transferral of bifacial point production from cryptocrystalline
materials (such as silcrete and chalcedony) in the Kimberley into larger glass forms after contact has been argued to be a product of its commoditisation for consumption by and for national and international museums (Harrison 2004a).
Molybdenum mineralization comprises blebs, streaks, books, and rosettes of molybdenite usually associated with dull, milky, cryptocrystalline
Gold mineralization is closely associated with pyrite in altered argillites, and occasionally in siltstones and the footwall massive sandstone where it is mainly related to zones of cryptocrystalline
grey quartz veining with strong silicification haloes.
Simple flaked lithic industries on cryptocrystalline
raw materials, without pottery, were also found in an upper terrace of Bukit Pantaraan (directly above the Neolithic location just discussed), and also in the Neolithic layers themselves at Pantaraan 1, although in this case there is a strong possibility that they eroded from the upper terrace during the Neolithic occupation.
No regional zoning of zeolite assemblages was apparent in this study Figure 8 shows that the zoning sequence and textural evidence suggest the following crystallisation sequence: first K-rich clay (nontronite) followed by K-rich mica (celadonite), carbonate (calcite), cryptocrystalline
silica (e g chalcedony), then thomsonite followed by chabazite, analcime, phillipsite and wairakite, and natrolite, laumontite, and stilbite-type minerals (stilbite and stellerite) Zeolites' stability ields are known from modern hydrothermal systems (Kristmannsdottir and Tomasson, 1978) and the observed sequence in the samples studied here conformed to a progressive decrease in temperature favouring hydrothermal system hydration.
AMC's vision and focus during the past 15 years has been to value add to the world's largest source of cryptocrystalline
magnesite at Kunwarara near Rockhampton in Central Queensland through a range of successful magnesia product applications, processes and research projects.
Of note in the Palaeolithic portion of this sequence (Components 1-4) is a long period (Component 1) of apparently sporadic, low-intensity occupation during MIS4/5 and early MIS3 (from before 80 to 42 kya), a more substantial occupation (Component 2) during late MIS3 (42-33 kya), near abandonment of the site (Component 3) during the LGM (33-20 kya), and substantial increases in artefact density and diversity in the terminal Pleistocene (20-13 kya) (Component 4)--most notably the introduction of a cryptocrystalline
silicate (CCS: e.
Thus the gap is almost unrecognizable in the Ikla and Staicele cores, where the nodular wackestones of the Rumba Formation lie upon the cryptocrystalline
(micritic) limestones of the Staicele Member of the uppermost Saarde Formation.
The stone bit is made of siliceous stone, most probably cryptocrystalline
silicate, and has a 25.
Along the contact between marl and limestone are numerous nodules of micro- and cryptocrystalline
radiolarian chert of Jurassic age (P.
The Burt Range Formation has surface occurrences of cryptocrystalline
silica suitable for flaking, including cherts, silcrete and chalcedony.