BharatNotes Lignite
nounUsage in a UPSC answer
India's heavy reliance on lignite and other low-grade coal for power generation underscores the central tension in its energy transition: reconciling the imperative of affordable, indigenous electricity with the binding commitments of its climate diplomacy.
Synonyms
Antonyms
Word Family
lignitic (adj), lignin (n), lignum (n), lignocellulose (n)
Root
Latin lignum = firewood, wood + -ite = mineral suffix; first recorded in English 1808
Etymology
From French lignite, from Latin lignum ("firewood, wood") + the mineral suffix -ite; first recorded in English in 1808.
Memory Hook
Lignite hides the Latin LIGNUM ("wood") - picture a "light" (lig-) brown coal that still looks like burnt wood, the lowest grade you can ignite.
How This Word Works in UPSC Writing
A soft brown low-grade coal sitting between peat and bituminous coal in the coalification sequence. That sequence runs peat, lignite, bituminous, anthracite, with carbon content and calorific value rising and moisture falling along it, and knowing the order answers most questions on the topic. Lignite's high moisture and ash and low calorific value make it uneconomic to transport far, which is why it is burnt at pithead power stations rather than railed across the country. India's principal lignite field is Neyveli in Tamil Nadu, with further deposits in Rajasthan, Gujarat and Jammu and Kashmir, and unlike India's main coal reserves, which are Gondwana in age and concentrated in the eastern belt, lignite is of the younger Tertiary period. The policy tension is direct: lignite is indigenous and supports energy security, yet it is the most carbon and pollution intensive coal per unit of energy delivered.
Don’t Confuse It With
The coalification sequence runs peat, lignite, bituminous and anthracite, with carbon content and calorific value increasing and moisture decreasing, so anthracite is the highest grade and peat scarcely a coal. Coking coal, used to make steel, is a low-ash bituminous coal, and India's shortage of it is why coking coal is imported while thermal coal is largely domestic. Gondwana coal is older and forms the bulk of India's reserves, while Tertiary coal, which includes lignite, is younger and poorer in quality.
Hindi Meaning
लिग्नाइट or भूरा कोयला (bhūrā koylā); एन्थ्रेसाइट for anthracite.
Common Questions
- Where is lignite mined in India?
- Chiefly at Neyveli in Tamil Nadu, with further deposits in Rajasthan, Gujarat and Jammu and Kashmir.
- How does lignite differ from anthracite?
- Lignite is a soft brown coal high in moisture and low in carbon and calorific value, while anthracite is the hardest and highest grade, with the greatest carbon content and least moisture.
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