| Class: | 5E |
| Name: | Chau Tsz Lam |
| Year: | 2014 – 2015 |
| 地質年代：(化石) (岩石)
化學組成, 鍵及結構：(礦物) 不詳 |
Geological Age: (Fossil) (Rock)
Chemical composition, bonding and structure: (Mineral) Unknown |
| 形成：(岩石) (礦物)
原生物：(化石) 鹼性玄武岩鹼性火成岩，它含有足夠的鉀有利於生產鉀長石 |
Formation:(Rock) (Mineral)
Living Specimens: (Fossil) Essexite is an alkaline igneous rock equivalent to an alkaline basalt. The presence of nepheline, a feldspathoid mineral, indicates that essexites are silica undersaturated. The presence of orthoclase indicates that it contains sufficient potassium to favor production of orthoclase over microcline or potassic oligoclase. Essexites are generally rich in aluminium, alkalis (sodium and calcium), potassium (>3% K2O), LILE-enriched (strontium, caesium and barium), as compared to tholeiitic basalts and gabbros.
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| 特性：
粗粒深成岩 含有顯著的輝石晶體 |
Properties:
Essexite, formely known as nepheline monzo gabbro or simply nepheline gabbro is a coarse grained plutonic rock belonging to the igneous category. contain prominent augite crystals. |
| 用途：(岩石) (礦物)
曾一度在歷史上作為冰壺石 |
Application: (Rock) (Mineral)
one time historically used as curling stones. Samples are supplied in a white card tray with label |
| 分佈：(岩石) (礦物)
蘇格蘭，英國 |
Distribution: (Rock) (Mineral)
it found in Essex County, Massachusetts, USA |