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薔薇輝石

蔷薇辉石
秘鲁安卡什大区博洛涅西省瓦兰卡区丘鲁库圣马丁矿的蔷薇辉石。尺寸:53 x 52 x 40 mm
基本資料
類別鏈矽酸鹽礦物
化学式CaMn3Si5O15[1]
IMA記號Rdn[2][3]
施特龙茨分类9.DK.05
戴納礦物分類65.04.01.01
晶体分类平行双面 (1)
H-M记号相同)
晶体空间群P1
晶胞a = 9.758 Å, b = 10.499 Å, c = 12.205 Å; α = 108.58°, β = 102.92°, γ = 82.52°; Z = 20
性質
顏色粉红色、玫瑰粉红色至棕红色、红色、灰色和黄色
晶体惯态板状晶体,块状,粒状
晶系三斜
雙晶{010}层状,复合平面
解理{110}和{110}完美,(110) ^ (110) = 92.5°;{001}良好
断口贝壳状到参差状
莫氏硬度5.5–6.5
光澤玻璃光泽到珍珠光泽
條痕白色
透明性透明到半透明
比重3.57–3.76
光學性質双轴 (+)
折射率nα = 1.711–1.738, nβ = 1.714–1.741, nγ = 1.724–1.751
双折射δ = 0.013
多色性
2V夹角58° - 73°(测量),58°(计算)
可轉變為外观通常因氧化锰而变黑
參考文獻[4][3][5]

薔薇輝石(英語:Rhodonite),又称玫瑰石[註 1],是一种含鏈矽酸鹽矿物以及準輝石族的成员,以三斜晶系结晶。它通常以可解理的形式出現,呈現玫瑰紅色(這個名字來源於希臘ῥόδοςrhodos,玫瑰色),由於表面氧化,因此往往趨近於褐色。

薔薇輝石的晶體通常有厚板狀习性,但很少見。它有一個完美的棱柱形解理,幾乎成直角。硬度為5.5-6.5,和比重3.4-3.7;光澤為玻璃光澤,在解理面上不太常见。通常部分被、有时是取代,这些锌有时可能大量存在;一种含有高達20%氧化鈣的灰棕色品種被稱為鈣薔薇輝石; 鋅薔薇輝石是一种含鋅品種,含有氧化鋅7%。

薔薇輝石是马萨诸塞州的官方宝石[6]

与黑色氧化锰形成鲜明对比的粉红色蔷薇辉石有时被用作宝石材料,如内华达州洪堡县的这个标本中所见。

晶體結構

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薔薇輝石的鏈矽酸鹽結構有五個二氧化矽四面體的重複單元。稀有的多型体三斜錳輝石是在不同的壓力與溫度條件下形成,化學成分相同,但有七個四面體的重複單元。

薔薇輝石族礦物

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2019年經過晶體結構的分析,過去被稱為薔薇輝石的礦物又可以再細分以下幾種,並建立「薔薇輝石族礦物」。[1][3]

  • 狹義的薔薇輝石 (Rhodonite、CaMn2+3Mn2+(Si5O15))
  • Vittinkiite[註 2](Vittinkiite、MnMn3Mn(Si5O15))[7]
  • 鐵薔薇輝石(Ferrorhodonite、CaMn3Fe(Si5O15))[8]

另见

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註釋

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  1. ^ 要注意一些帶有薔薇輝石含錳的變質岩也會被稱為玫瑰石,在這個情況之下的玫瑰石就不等於薔薇輝石
  2. ^ 尚無中文名稱

參考资料

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  1. ^ 1.0 1.1 Shchipalkina, N.V., Pekov, I.V., Chukanov, N.V., Biagioni, C., Pasero, M. Crystal chemistry and nomenclature of rhodonite-group minerals. Mineralogical Magazine. October 09, 2019, 83: 829–835 [August 31, 2023]. doi:10.1180/mgm.2019.65. (原始内容存档于2023-08-31). 
  2. ^ Warr, L.N. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 2021, 85: 291–320 [2022-08-08]. (原始内容存档于2021-11-19). 
  3. ^ 3.0 3.1 3.2 Rhodonite页面存档备份,存于互联网档案馆), Mindat.org.
  4. ^ Handbook of Mineralogy页面存档备份,存于互联网档案馆.
  5. ^ Rhodonite页面存档备份,存于互联网档案馆), Webmineral data.
  6. ^ General Laws of Massachusetts, Chapter 2, Section 15页面存档备份,存于互联网档案馆).
  7. ^ Vittinkiite页面存档备份,存于互联网档案馆), Mindat.org
  8. ^ Ferrorhodonite页面存档备份,存于互联网档案馆), Mindat.org

 本条目包含来自公有领域出版物的文本: Chisholm, Hugh (编). Rhodonite. Encyclopædia Britannica (第11版). London: Cambridge University Press. 1911. 

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薔薇輝石
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