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Alunite Collection Image, Figure 1, Total 20 Figures
Alunite Collection Image, Figure 2, Total 20 Figures
Alunite Collection Image, Figure 3, Total 20 Figures
Alunite Collection Image, Figure 4, Total 20 Figures
Alunite Collection Image, Figure 5, Total 20 Figures
Alunite Collection Image, Figure 6, Total 20 Figures
Alunite Collection Image, Figure 7, Total 20 Figures
Alunite Collection Image, Figure 8, Total 20 Figures
Alunite Collection Image, Figure 9, Total 20 Figures
Alunite Collection Image, Figure 10, Total 20 Figures
Alunite Collection Image, Figure 11, Total 20 Figures
Alunite Collection Image, Figure 12, Total 20 Figures
Alunite Collection Image, Figure 13, Total 20 Figures
Alunite Collection Image, Figure 14, Total 20 Figures
Alunite Collection Image, Figure 15, Total 20 Figures
Alunite Collection Image, Figure 16, Total 20 Figures
Alunite Collection Image, Figure 17, Total 20 Figures
Alunite Collection Image, Figure 18, Total 20 Figures
Alunite Collection Image, Figure 19, Total 20 Figures
Alunite Collection Image, Figure 20, Total 20 Figures
Alunite Collection Image, Figure 1, Total 20 FiguresAlunite Collection Image, Figure 2, Total 20 FiguresAlunite Collection Image, Figure 3, Total 20 Figures
Alunite Collection Image, Figure 4, Total 20 FiguresAlunite Collection Image, Figure 5, Total 20 FiguresAlunite Collection Image, Figure 6, Total 20 Figures
Alunite Collection Image, Figure 7, Total 20 FiguresAlunite Collection Image, Figure 8, Total 20 FiguresAlunite Collection Image, Figure 9, Total 20 Figures
Alunite Collection Image, Figure 10, Total 20 FiguresAlunite Collection Image, Figure 11, Total 20 FiguresAlunite Collection Image, Figure 12, Total 20 Figures
Alunite Collection Image, Figure 13, Total 20 FiguresAlunite Collection Image, Figure 14, Total 20 FiguresAlunite Collection Image, Figure 15, Total 20 Figures
Alunite Collection Image, Figure 16, Total 20 FiguresAlunite Collection Image, Figure 17, Total 20 FiguresAlunite Collection Image, Figure 18, Total 20 Figures
Alunite Collection Image, Figure 19, Total 20 FiguresAlunite Collection Image, Figure 20, Total 20 Figures
Alunite
  • reservation_info
    • serial_no2:M05-015
    • title_en:Alunite
    • amount:1
    • :2004/04/12
  • gdesc_info
    • GDESC:　　標本M05-015為明礬石，化學成分KAl3(SO4)2(OH)6，屬硫酸鹽類礦物。其英文Alunite一詞源自於拉丁文的alum，即明礬的意思。
      　　明礬石之結晶屬於六方晶系，於物理特性上，比重約介於2.60至2.80，莫氏硬度為3.5至4，解理面發育優良且具有脆性，斷口呈現多片狀、貝殼狀或不規則的參差斷口，明礬石之條痕為白色，結晶可能為透明至半透明，可能呈現玻璃或是珍珠光澤，明礬石質地純淨時呈無色透明，一般常見顏色為白色、黃色、淺灰色，也可能呈現紅色或棕色，不具有螢光特性及磁性。明礬石成分當中之鉀離子有時可被鈉離子替代，鈉含量超過鉀含量時則稱為鈉明礬石，而若成分中鋁被鐵所取代，則形成黃鉀鐵礬。
      　　明礬石於自然環境中經常由硫酸與含鉀之長石之化學反應產生，有時也可能形成於火山噴氣口，結晶大多呈隱晶質的緻密塊狀或土狀，有時會形成菱面體結晶外形。臺灣明礬石主要產於金瓜石礦區以及陽明山大屯火山群，於東部海岸山脈亦有零星紀錄。世界上的產地分布廣泛，包含義大利、智利、美國及法國等地。
      　　明礬石為自然界中最主要的天然明礬來源，古時用來淨水及除臭，現代工業上可用於造紙及製革等工業。有時部分地區之明礬石產生富集的礦床，也具有鉀礦與鋁礦開採的經濟價值。
      　　本標本由日本人岡本要八郎所收集，原產地為新北市瑞芳鎮金瓜石，標本長寬約為12 x 5公分，明礬石以塊狀晶簇產出，顏色為無色至白色，結晶介於透明至半透明並帶有玻璃或珍珠光澤，可觀察到鱗片狀之結晶外形。
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