矽鈹石

{{infobox mineral
| name = 矽鈹石
| boxwidth =
| boxbgcolor =
| image = Fenacitas.jpg
| imagesize = 260px
| alt =
| caption = 矽鈹石晶體
| category = 島矽酸鹽礦物
| formula = Be2SiO4
| IMAsymbol = Phk
| molweight =
| strunz = 9.AA.05
| dana = 51.1.1.1
| system = 三斜
| class = 菱面体 ()
H-M記號：()
| symmetry = R
| unit cell = a = 12.438 Å, c = 8.231 Å; Z = 18
| color = 無色、黃色、粉紅色、棕色
| colour =
| habit = 板狀、棱柱狀至針狀晶體，通常為柱狀聚集體、球狀和粒狀
| twinning = {0001}附近滲透雙晶
| cleavage = {110}明顯、{101}不完全
| fracture = 貝殼狀
| tenacity = 脆性
| mohs = 7.5 – 8
| luster = 玻璃光澤
| streak =
| diaphaneity = 透明到半透明
| gravity = 2.93 – 3.00
| density =
| polish =
| opticalprop = 單軸 (+)
| refractive = nω = 1.650 - 1.656 nε = 1.667 - 1.670
| birefringence = δ = 0.017
| pleochroism =
| 2V =
| dispersion =
| extinction =
| length fast/slow =
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| absorption =
| melt =
| fusibility =
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| impurities =
| alteration =
| other = 亮藍色陰極發光
| prop1 =
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}}

矽鈹石（）是一種稀有的含鈹島矽酸鹽礦物，化學式為Be2SiO4。矽鈹石常以單晶的形式出現，偶爾被用作寶石。其斷口呈貝殼狀，無解理，莫氏硬度為7.5-8，比重為2.96。晶體有時無色透明，更常見的是呈灰色或黃色且半透明，有時呈淡玫瑰紅色。從外觀來看，這種礦物與石英相似，且容易混淆。其名稱源自於，意為「欺騙者」，由Nils Gustaf Nordenskiöld於1833年命名。在Noumas II偉晶岩（南非北開普省奧蘭治河偉晶岩帶的一部分）的綠柱石溶洞中發現了呈棱柱狀的小型寶石級矽鈹石單晶。在緬因州的Greenwood發現直径为，重的大晶体水晶，但這些是有石英礦物假象的矽鈹石。

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