Hemimorphite

Japanese: 異極鉱 - いきょくこう(英語表記)hemimorphite
Hemimorphite

It is a solo silicate mineral. It occurs as flat crystals or in bundles. The crystals show a characteristic hemimorphy (crystals with different shapes at both ends), and the name is derived from this crystal shape. It occurs in the oxidation zone of zinc deposits along with other heavy metal secondary minerals. The most common secondary zinc minerals are smithsonite and hydrozincite. In Japan, it occurs at the Kamioka mine in Gifu Prefecture and the Kiura mine in Saiki City, Oita Prefecture. It also occurs very rarely in granitic pegmatites.

[Satoshi Matsubara]

[References] | Kamioka mine | Silicate minerals | Secondary minerals | Pegmatite | Smisite [Supplementary information] | Hemimorphite (Data Note)

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

ソロ珪(けい)酸塩鉱物の一つ。扁平な結晶として、あるいはそれらが束状に集合して産する。結晶は特徴的な異極像hemimorphy(両端の形が異なる結晶)を示し、名称もその結晶形に由来する。亜鉛鉱床の酸化帯に他の重金属二次鉱物とともに産する。亜鉛の二次鉱物としてもっとも普通に伴うのは、菱(りょう)亜鉛鉱、水亜鉛銅鉱などである。日本では岐阜県の神岡鉱山、大分県佐伯(さいき)市の木浦(きうら)鉱山などに産出した。また、ごくまれに花崗(かこう)岩質ペグマタイト中に産する。

[松原 聰]

[参照項目] | 神岡鉱山 | 珪酸塩鉱物 | 二次鉱物 | ペグマタイト | 菱亜鉛鉱[補完資料] | 異極鉱(データノート)

出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例

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