Crystal Properties Compared: Hardness, Chakra & Category Data for 213 Healing Stones

By Naomi Park · Updated 2026-08-01

About This Report

This is an original data analysis of all 213 entries in the HeartYearning Crystal reference, current as of 2026-08-01. We extracted Mohs hardness values for the 15 stones where mineralogical data was documented, classified each into a durability tier (soft, moderate, durable), and tallied every entry by its primary intention category. The goal is to surface structural patterns that single-crystal profiles cannot — which hardness ranges dominate the healing-stone market, how intention categories distribute, and what the durability data means for practical crystal care. Methodology: hardness values were parsed from the structured mohs_hardness field using a regular expression that captures the low and high end of each reported range (e.g., "5-5.5" → average 5.25); durability tiers follow the standard gemological convention (soft < 5, moderate 5-7, durable > 7); category counts come directly from the structured cat field on each entry.

Key Findings

• Intention is the largest category, with 58 entries (27.2%) — the reference is organized primarily by what a reader wants to do with a stone rather than by its mineral family.
• Of the 15 stones with documented hardness, 9 are moderate (5-7), 4 are soft (<5), and 2 are durable (>7) — the moderate range dominates, which mirrors the quartz-and-feldspar family that constitutes most of the healing-stone market.
• The softest documented stone is Selenite (avg 2.0), requiring dry-only cleansing and careful storage — a direct care implication.
• The hardest documented stone is Aquamarine (avg 7.75), suitable for water cleansing and daily-wear jewelry.
• The dataset spans 24 distinct categories from intention-based (love, protection, abundance) to practical (care, cleansing, buying) — a structure that mirrors how readers actually shop for and work with stones.

Mohs Hardness Comparison

The Mohs scale ranks mineral hardness from 1 (talc) to 10 (diamond). For the 15 stones in the reference with documented hardness data, the chart below shows the average of each stone's reported range, sorted from softest to hardest. Bar color encodes the durability tier: red for soft (<5), amber for moderate (5-7), green for durable (>7).

The spread is wide — from Selenite at 2.0 to Aquamarine at 7.75 — and the practical implications are direct. Soft stones (Selenite, Lepidolite, Malachite, Fluorite) must never be soaked in water or stored against harder stones, because harder minerals will scratch them. Durable stones (Black Tourmaline, Aquamarine) tolerate water cleansing, salt, and daily-wear jewelry settings. The moderate middle range — the largest group — is safe for short water rinses but should not be soaked or subjected to ultrasonic cleaners.

Crystal Category Distribution

The 24 categories in the reference reveal an intentional structure: stones are organized first by intention (what you want the stone to do), then by practice (how to care for, cleanse, and buy them), and finally by identity (zodiac and personality pairings). This inverts the mineralogical organization used in geology textbooks, which classify by chemical family — the HeartYearning reference prioritizes the reader's question ("which stone do I need?") over the chemist's ("what is this stone made of?").

The dominance of the intention category (58 entries) reflects the most common reader question: "which crystal should I use for [specific intention]?" The long tail of practice-focused categories (care, cleansing, buying) ensures that once a reader has chosen a stone, the same reference also tells them how to keep it.

Durability Rating Distribution

Grouping the 15 documented stones into three durability tiers makes the care implications immediately visible. The moderate tier (Mohs 5-7) is the largest — this is the hardness range of quartz (7) and the feldspar family (6-6.5), which together constitute the majority of stones sold in the healing-crystal market. The soft tier requires the most careful handling, and the durable tier is the most forgiving.

If you own stones from the soft tier — Selenite, Lepidolite, Malachite, Fluorite — the care protocol is non-negotiable: dry cleansing only (moonlight, selenite, smudging), no water soaking, no salt, no ultrasonic cleaners, and separate storage from harder stones. Stones in the durable tier — Black Tourmaline, Aquamarine — can be rinsed under running water, cleansed in salt, and worn daily in rings or bracelets without significant wear.

What This Means for Crystal Practice

Three practical implications follow from this data. First, the dominance of the moderate-hardness tier means that if you own a typical healing-crystal collection, most of your stones tolerate brief water contact but should not be soaked — the common "cleanse all your crystals in a bowl of salt water" advice is actively harmful for roughly a third of the documented stones. Second, the intention-first organization of the reference means that the right starting question is "what do I need this stone to do?" rather than "which stone is prettiest?" — the data shows the reference was built to answer the first question, not the second. Third, the small durable tier (only 2 of 15 documented stones) means that genuinely water-safe, scratch-resistant stones are statistically rare in the healing market — if you want a stone you can wear daily without thinking about it, your options are narrow and you should choose deliberately.

Explore More Crystals

The ten crystal entries below cover some of the most-consulted pages in the reference, drawn from across the intention categories.

About the Author

Naomi Park has been collecting crystals and minerals since 2015. What began as a hobby evolved into a serious study of mineralogy, crystal systems, and the traditional healing associations tied to each stone. She has built a personal collection of over 200 specimens and spends her time researching the geological formation, hardness, and cultural history behind each crystal she works with. At HeartYearning, she writes all crystal content, combining her collector's knowledge of mineral properties with the practical healing traditions associated with each stone. Read more about Naomi and the HeartYearning team on the About the Author page.