---
product_id: 766214133
title: "Moderock Periodic Table of Osmium Metallic Elements, Mirror Finish Density Cube Collection, 99.95% Purity, Weight 21.5g/21.5g (Male Cubic 10mm/0.39\")"
brand: "moderock"
price: "¥278"
currency: JPY
in_stock: false
url: https://www.desertcart.jp/products/766214133-moderock-periodic-table-of-osmium-metallic-elements-mirror-finish-density
store_origin: JP
region: Japan
---

# 99.95% pure osmium metal mirror-finish polished cube 21.5g ultra-dense weight Moderock Periodic Table of Osmium Metallic Elements, Mirror Finish Density Cube Collection, 99.95% Purity, Weight 21.5g/21.5g (Male Cubic 10mm/0.39")

**Brand:** moderock
**Price:** ¥278
**Availability:** ❌ Out of Stock

## Summary

> 🪙 Own the heaviest, rarest cube in the room—because ordinary metals just won’t cut it.

## Quick Answers

- **What is this?** Moderock Periodic Table of Osmium Metallic Elements, Mirror Finish Density Cube Collection, 99.95% Purity, Weight 21.5g/21.5g (Male Cubic 10mm/0.39") by moderock
- **How much does it cost?** ¥278 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/766214133-moderock-periodic-table-of-osmium-metallic-elements-mirror-finish-density)

## Best For

- moderock enthusiasts

## Why This Product

- Trusted moderock brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **4th Generation Upgrade:** Enhanced surface quality and density for a premium tactile and visual experience.
- • **Unmatched Density & Purity:** At 21.5g and 99.95% purity, this osmium cube is denser and purer than almost any other metal collectible.
- • **Precision-Crafted 10mm Cube:** Hand-polished and wire-cut for a flawless mirror finish and perfect cubic form.
- • **Rarest Heavy Metal on Earth:** Own a piece of the world’s scarcest platinum-group metal, with annual production under 1 ton.
- • **Exclusive Collector’s Item:** A rare, brittle metal cube that’s impossible to replicate—perfect for professionals who value exclusivity.

## Overview

The Moderock Periodic Table Osmium Cube is a 10mm, 21.5g block of 99.95% pure osmium, one of the rarest and densest platinum-group metals on Earth. Crafted through advanced powder metallurgy and hand-polished to a mirror finish, this 4th generation cube offers unmatched density and exclusivity, making it a coveted collector’s piece for discerning professionals.

## Description

Product description               Osmium is a heavy platinum precious metal, with very little stable elements in the crust and is rare, than Iridium. The annual production of the world is less than 1 ton and is extremely rare. Osmium metals are basically sold in the form of powder. The powder metallurgy to get the osmium block is very small, melting the osmium closer to the theoretical density of osmium. mium is even fee less.                  Safety Warning               Please handle with care. Do not take this product. Avoid skin and eyes. Keep out of reach of children and pets

## Features

- Osmium Metal, Periodic Table of Precious Metals, Osmium Cubic, High Purity Osmium Target, 10mm, Os≥99.95%, Slightly Chamfered
- The actual density is about 20.5 to 21.7 (due to the powder sintering process, it is difficult to process metal, so it cannot reach the theoretical density. You can only get it as close as possible. At the same time, each batch of the production process will have a little difference. Therefore, there may be slight differences in density.)
- Osmium is very difficult to process, difficult to make regular shapes, difficult to grind and wire cutting
- Osmium is almost the only metal that remains brittle, even near the melting point, and it cannot be heat treated or deformed under almost any circumstance, resulting in unusually difficult processing, and osmium treated products are extremely rare
- Our osmium target material is made of 9995 osmium powder sintered at high temperatures of over 22 density, and then hand polished through wire cutting, grinding machine to ensure a distinctive blue, impressive feel, and high cost performance. On the other hand, the Osmium Cube has been upgraded to 4th generation, and has been more denser than before and improved surface quality and mirror effect
- Osmium is a heavy platinum precious metal, with very little stable elements in the crust and is rare, than Iridium. The annual production of the world is less than 1 ton and is extremely rare. Osmium metals are basically sold in the form of powder. The powder metallurgy to get the osmium block is very small, melting the osmium closer to the theoretical density of osmium. mium is even fee less
- Osmium is inherently a fairly dense monomer, with a density of 8.9 oz/cm3, a melting point of up to 3045 °C, and is sold in the form of an Osmium and the density of the Osmium is very high. Osmium in natural world is usually present in the form of pure metals and alloys, and Osmium is basically a by-product and production form of copper and nickel mining and purification process
- Osmium powder is a grayish blue color, and the osmium chunks are a deep and attractive blue color. The internet shows that the blue color of Osmium comes from Osmium Dioxide, but the owner can't find the evidence that the blue color of Osmium comes from the Osmium dioxide, rather the fresh crushing surface of the Osmium is also blue and is blue when cut in an argon environment, the owner believes that blue color is the true color of the Osmium. mium In high density, the osmium is stable at room temperature, and the osmium metal is hard and brittle, easily broken down into powder

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Moderock Ltd. |
| Material | Osmium |
| Color | Os |
| Size | 10mm x 10mm x 10mm |
| Material Care Instructions | Wipe with Dry Cloth |
| Brand Name | Moderock |
| Item Weight | 23 g |

## Product Details

- **Brand:** Moderock
- **Product Dimensions:** 10D x 10W x 10H mm
- **Item Weight:** 23 g
- **Frame Material:** Metal
- **Color:** Os

## Images

![Moderock Periodic Table of Osmium Metallic Elements, Mirror Finish Density Cube Collection, 99.95% Purity, Weight 21.5g/21.5g (Male Cubic 10mm/0.39") - Image 1](https://m.media-amazon.com/images/I/61k4npJdFhL.jpg)
![Moderock Periodic Table of Osmium Metallic Elements, Mirror Finish Density Cube Collection, 99.95% Purity, Weight 21.5g/21.5g (Male Cubic 10mm/0.39") - Image 2](https://m.media-amazon.com/images/I/71zRvpRmqwL.jpg)
![Moderock Periodic Table of Osmium Metallic Elements, Mirror Finish Density Cube Collection, 99.95% Purity, Weight 21.5g/21.5g (Male Cubic 10mm/0.39") - Image 3](https://m.media-amazon.com/images/I/612kIuSd7mL.jpg)
![Moderock Periodic Table of Osmium Metallic Elements, Mirror Finish Density Cube Collection, 99.95% Purity, Weight 21.5g/21.5g (Male Cubic 10mm/0.39") - Image 4](https://m.media-amazon.com/images/I/71SjqgNOSRL.jpg)
![Moderock Periodic Table of Osmium Metallic Elements, Mirror Finish Density Cube Collection, 99.95% Purity, Weight 21.5g/21.5g (Male Cubic 10mm/0.39") - Image 5](https://m.media-amazon.com/images/I/71ZKMFCrAqL.jpg)

## Available Options

This product comes in different **Color** options.

## Frequently Bought Together

- Moderock Osmium Metal Elements Periodic Table, Mirror Finished Density Cubes Collection, Purity 99.95%, Weight 21.5g/0.76Oz (Os Cubic 10mm/0.39")
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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-16*