Fukalite, a new calcium carbonate silicate hydrate mineral

Henmi, Chiyoko; Kusachi, Isao; Kawahara, Akira; Henmi, Kitinosuke

doi:10.2465/minerj.8.374

Cited by 24 publications

(14 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent observations by Henmi, Kawahara, Henmi, Kusachi & Takeuchi (1983) indicate that at high temperatures the (2) polytype may be stabilized relative to the (oo> structure. In a temperature range intermediate between those dominated by the (2> and the (oo) phases, they reported the occurrence of minor amounts of polytypes with (3), (4) and (5) structures.…”

Section: A Model For Polytypic Behaviourmentioning

confidence: 99%

The application of the ANNNI model to polytypic behaviour

Price¹,

Yeomans²

1984

Acta Crystallogr Sect B

View full text Add to dashboard Cite

We show that many of the important features of polytypism are reproduced by a simple spin model, the axial next-nearest-neighbour Ising (ANNNI) model. The phase diagram of the ANNNI model contains sequences of long-wavelength-modulated phases. These correspond to the long stacking sequences developed in polytypic series, and are stabilized by a subtle balance between energy and entropy which results from short-range competing interactions. We discuss the extent to which this mechanism can describe polytypism in the spinelloids, pyroxenes, silicon carbide and other mineral phases.

show abstract

Section: A Model For Polytypic Behaviourmentioning

confidence: 99%

The application of the ANNNI model to polytypic behaviour

Price¹,

Yeomans²

1984

Acta Crystallogr Sect B

View full text Add to dashboard Cite

show abstract

“…The skarns consist mainly of gehlenite and spurrite. Some parts of the skams are altered to retrograde minerals such as garnet, vesuvianite, bicchulite (Henmi et al, 1973), fukalite (Henmi et al, 1977) and others. Contaminated rocks occur between the quartz monzonite and skarns.…”

Section: Occurrencementioning

confidence: 99%

Morimotoite, Ca₃TiFe²⁺Si₃O₁₂, a new titanian garnet from Fuka, Okayama Prefecture, Japan

Henmi¹,

Kusachi

Henmi³

1995

Mineral. mag.

Self Cite

View full text Add to dashboard Cite

Morimotoite, Ca3TiFe2+Si3012, has been found in contaminated rocks which are considered to be a kind of endoskarn at Fuka, Bitchu-Cho, Okayama Prefecture, Japan. Morimotoite is derived from andradite, Ca3Fe3 § by the substitution Ti + Fe z+ = 2Fe 3 § It is associated with calcite, vesuvianite, grossular, wollastonite, hematite, prehnite, fluorapatite, perovskite, zircon, baddeleyite and calzirtite. It is cubic with space group Ia3d. The unit cell dimension a is 12.162(3) A. Its refractive index n is 1.995(2) and the density 3.75(2) g cm -3 (meas.), 3.80 g cm -3 (calc.). The Mohs' hardness is 7.5. Calculation of the analytical data on the basis of twelve oxygen atoms and eight cations shows that this mineral has a simplified chemical formula Ca3 (Ti,FeZ §247247 where Ti > Fe 2+ > 0.5. Morimotoite was synthesized at low oxygen fugacities, 650 and 700~ and 1 kbar total pressure.

show abstract

“…introduction Fukalite was first found at Fuka, Okayama Prefecture, Japan (Henmi et al 1977), and subsequently at Mihara, in the same Prefecture, and Kushiro, Hiroshima Prefecture. In the three localities, fukalite occurs in spurrite-gehlenite skarns as an alteration product of spurrite.…”

mentioning

confidence: 99%

Fukalite: An example of an OD structure with two-dimensional disorder

Merlino¹,

Bonaccorsi²,

Грабежев³

et al. 2009

American Mineralogist

View full text Add to dashboard Cite

The real crystal structure of fukalite, Ca 4 Si 2 O 6 (OH) 2 (CO 3 ), was solved by means of the application of order-disorder (OD) theory and was refined through synchrotron radiation diffraction data from a single crystal. The examined sample came from the Gumeshevsk skarn copper porphyry deposit in the Central Urals, Russia. The selected crystal displays diffraction patterns characterized by strong reflections, which pointed to an orthorhombic sub-structure (the "family structure" in the OD terminology), and additional weaker reflections that correspond to a monoclinic real structure.The refined cell parameters are a = 7.573 (3), b = 23.364 (5), c = 11.544(4) Å, β = 109.15(1)°, space group P2 1 /c. This unit cell corresponds to one of the six possible maximum degree of order (MDO) polytypes, as obtained by applying the OD procedure. The derivation of the six MDO polytypes is presented in the Appendix 1 . The intensity data were collected at the Elettra synchrotron facility (Trieste, Italy); the structure refinement converged to R = 0.0342 for 1848 reflections with I > 2σ(I) and 0.0352 for all 1958 data.The structure of fukalite may be described as formed by distinct structural modules: a calcium polyhedral framework, formed by tobermorite-type polyhedral layers alternating along b with tilleyitetype zigzag polyhedral layers; silicate chains with repeat every fifth tetrahedron, running along a and linked to the calcium polyhedral layers on opposite sides; and finally rows of CO 3 groups parallel to (100) and stacked along a.

show abstract

Fukalite, a new calcium carbonate silicate hydrate mineral

Cited by 24 publications

References 1 publication

The application of the ANNNI model to polytypic behaviour

The application of the ANNNI model to polytypic behaviour

Morimotoite, Ca₃TiFe²⁺Si₃O₁₂, a new titanian garnet from Fuka, Okayama Prefecture, Japan

Fukalite: An example of an OD structure with two-dimensional disorder

Contact Info

Product

Resources

About

Fukalite, a new calcium carbonate silicate hydrate mineral

Cited by 24 publications

References 1 publication

The application of the ANNNI model to polytypic behaviour

The application of the ANNNI model to polytypic behaviour

Morimotoite, Ca3TiFe2+Si3O12, a new titanian garnet from Fuka, Okayama Prefecture, Japan

Fukalite: An example of an OD structure with two-dimensional disorder

Contact Info

Product

Resources

About

Morimotoite, Ca₃TiFe²⁺Si₃O₁₂, a new titanian garnet from Fuka, Okayama Prefecture, Japan